error sets - update langref. all tests passing
Andrew Kelley
parent
0d5ff6f462
commit
76239f2089
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@ -108,7 +108,7 @@
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{#code_begin|exe|hello#}
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const std = @import("std");
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pub fn main() %void {
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pub fn main() !void {
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// If this program is run without stdout attached, exit with an error.
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var stdout_file = try std.io.getStdOut();
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// If this program encounters pipe failure when printing to stdout, exit
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@ -129,8 +129,8 @@ pub fn main() void {
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}
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{#code_end#}
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<p>
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Note that we also left off the <code class="zig">%</code> from the return type.
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In Zig, if your main function cannot fail, you may use the <code class="zig">void</code> return type.
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Note that we also left off the <code class="zig">!</code> from the return type.
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In Zig, if your main function cannot fail, you must use the <code class="zig">void</code> return type.
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</p>
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{#see_also|Values|@import|Errors|Root Source File#}
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{#header_close#}
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@ -151,10 +151,7 @@ const warn = std.debug.warn;
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const os = std.os;
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const assert = std.debug.assert;
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// error declaration, makes `error.ArgNotFound` available
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error ArgNotFound;
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pub fn main() %void {
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pub fn main() void {
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// integers
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const one_plus_one: i32 = 1 + 1;
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warn("1 + 1 = {}\n", one_plus_one);
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@ -183,7 +180,7 @@ pub fn main() %void {
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@typeName(@typeOf(nullable_value)), nullable_value);
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// error union
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var number_or_error: %i32 = error.ArgNotFound;
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var number_or_error: error!i32 = error.ArgNotFound;
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warn("\nerror union 1\ntype: {}\nvalue: {}\n",
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@typeName(@typeOf(number_or_error)), number_or_error);
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@ -691,7 +688,7 @@ const warn = @import("std").debug.warn;
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extern fn foo_strict(x: f64) f64;
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extern fn foo_optimized(x: f64) f64;
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pub fn main() %void {
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pub fn main() void {
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const x = 0.001;
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warn("optimized = {}\n", foo_optimized(x));
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warn("strict = {}\n", foo_strict(x));
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@ -1046,7 +1043,7 @@ a catch |err| b</code></pre></td>
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<code>err</code> is the <code>error</code> and is in scope of the expression <code>b</code>.
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</td>
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<td>
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<pre><code class="zig">const value: %u32 = null;
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<pre><code class="zig">const value: error!u32 = error.Broken;
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const unwrapped = value catch 1234;
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unwrapped == 1234</code></pre>
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</td>
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@ -1279,7 +1276,8 @@ const ptr = &x;
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{#header_close#}
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{#header_open|Precedence#}
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<pre><code>x() x[] x.y
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!x -x -%x ~x *x &x ?x %x ??x
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a!b
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!x -x -%x ~x *x &x ?x ??x
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x{}
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! * / % ** *%
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+ - ++ +% -%
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@ -2278,8 +2276,8 @@ fn eventuallyNullSequence() ?u32 {
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break :blk numbers_left;
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};
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}
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error ReachedZero;
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fn eventuallyErrorSequence() %u32 {
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fn eventuallyErrorSequence() error!u32 {
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return if (numbers_left == 0) error.ReachedZero else blk: {
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numbers_left -= 1;
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break :blk numbers_left;
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@ -2408,7 +2406,7 @@ fn typeNameLength(comptime T: type) usize {
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// If expressions have three uses, corresponding to the three types:
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// * bool
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// * ?T
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// * %T
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// * error!T
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const assert = @import("std").debug.assert;
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@ -2469,20 +2467,18 @@ test "if nullable" {
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}
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}
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error BadValue;
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error LessBadValue;
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test "if error union" {
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// If expressions test for errors.
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// Note the |err| capture on the else.
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const a: %u32 = 0;
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const a: error!u32 = 0;
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if (a) |value| {
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assert(value == 0);
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} else |err| {
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unreachable;
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}
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const b: %u32 = error.BadValue;
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const b: error!u32 = error.BadValue;
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if (b) |value| {
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unreachable;
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} else |err| {
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@ -2500,7 +2496,7 @@ test "if error union" {
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}
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// Access the value by reference using a pointer capture.
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var c: %u32 = 3;
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var c: error!u32 = 3;
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if (c) |*value| {
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*value = 9;
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} else |err| {
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@ -2568,8 +2564,7 @@ test "defer unwinding" {
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//
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// This is especially useful in allowing a function to clean up properly
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// on error, and replaces goto error handling tactics as seen in c.
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error DeferError;
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fn deferErrorExample(is_error: bool) %void {
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fn deferErrorExample(is_error: bool) !void {
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warn("\nstart of function\n");
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// This will always be executed on exit
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@ -2678,7 +2673,7 @@ test "foo" {
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assert(value == 1234);
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}
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fn bar() %u32 {
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fn bar() error!u32 {
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return 1234;
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}
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@ -2791,13 +2786,8 @@ test "implicitly cast to const pointer" {
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One of the distinguishing features of Zig is its exception handling strategy.
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</p>
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<p>
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Among the top level declarations available is the error value declaration:
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TODO rewrite the errors section to take into account error sets
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</p>
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{#code_begin|syntax#}
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error FileNotFound;
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error OutOfMemory;
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error UnexpectedToken;
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{#code_end#}
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<p>
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These error values are assigned an unsigned integer value greater than 0 at
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compile time. You are allowed to declare the same error value more than once,
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@ -2809,26 +2799,23 @@ error UnexpectedToken;
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</p>
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<p>
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Each error value across the entire compilation unit gets a unique integer,
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and this determines the size of the pure error type.
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and this determines the size of the error set type.
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</p>
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<p>
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The pure error type is one of the error values, and in the same way that pointers
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cannot be null, a pure error is always an error.
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The error set type is one of the error values, and in the same way that pointers
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cannot be null, a error set instance is always an error.
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</p>
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{#code_begin|syntax#}const pure_error = error.FileNotFound;{#code_end#}
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<p>
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Most of the time you will not find yourself using a pure error type. Instead,
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likely you will be using the error union type. This is when you take a normal type,
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and prefix it with the <code>%</code> operator.
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Most of the time you will not find yourself using an error set type. Instead,
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likely you will be using the error union type. This is when you take an error set
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and a normal type, and create an error union with the <code>!</code> binary operator.
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</p>
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<p>
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Here is a function to parse a string into a 64-bit integer:
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</p>
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{#code_begin|test#}
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error InvalidChar;
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error Overflow;
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pub fn parseU64(buf: []const u8, radix: u8) %u64 {
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pub fn parseU64(buf: []const u8, radix: u8) !u64 {
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var x: u64 = 0;
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for (buf) |c| {
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@ -2867,13 +2854,14 @@ test "parse u64" {
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}
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{#code_end#}
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<p>
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Notice the return type is <code>%u64</code>. This means that the function
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either returns an unsigned 64 bit integer, or an error.
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Notice the return type is <code>!u64</code>. This means that the function
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either returns an unsigned 64 bit integer, or an error. We left off the error set
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to the left of the <code>!</code>, so the error set is inferred.
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</p>
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<p>
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Within the function definition, you can see some return statements that return
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a pure error, and at the bottom a return statement that returns a <code>u64</code>.
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Both types implicitly cast to <code>%u64</code>.
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an error, and at the bottom a return statement that returns a <code>u64</code>.
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Both types implicitly cast to <code>error!u64</code>.
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</p>
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<p>
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What it looks like to use this function varies depending on what you're
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@ -2900,7 +2888,7 @@ fn doAThing(str: []u8) void {
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<p>Let's say you wanted to return the error if you got one, otherwise continue with the
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function logic:</p>
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{#code_begin|syntax#}
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fn doAThing(str: []u8) %void {
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fn doAThing(str: []u8) !void {
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const number = parseU64(str, 10) catch |err| return err;
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// ...
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}
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@ -2909,7 +2897,7 @@ fn doAThing(str: []u8) %void {
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There is a shortcut for this. The <code>try</code> expression:
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</p>
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{#code_begin|syntax#}
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fn doAThing(str: []u8) %void {
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fn doAThing(str: []u8) !void {
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const number = try parseU64(str, 10);
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// ...
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}
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@ -2959,7 +2947,7 @@ fn doAThing(str: []u8) void {
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Example:
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</p>
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{#code_begin|syntax#}
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fn createFoo(param: i32) %Foo {
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fn createFoo(param: i32) !Foo {
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const foo = try tryToAllocateFoo();
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// now we have allocated foo. we need to free it if the function fails.
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// but we want to return it if the function succeeds.
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@ -3567,7 +3555,7 @@ pub fn main() void {
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{#code_begin|syntax#}
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/// Calls print and then flushes the buffer.
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pub fn printf(self: &OutStream, comptime format: []const u8, args: ...) %void {
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pub fn printf(self: &OutStream, comptime format: []const u8, args: ...) error!void {
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const State = enum {
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Start,
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OpenBrace,
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@ -3639,7 +3627,7 @@ pub fn printf(self: &OutStream, comptime format: []const u8, args: ...) %void {
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and emits a function that actually looks like this:
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</p>
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{#code_begin|syntax#}
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pub fn printf(self: &OutStream, arg0: i32, arg1: []const u8) %void {
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pub fn printf(self: &OutStream, arg0: i32, arg1: []const u8) !void {
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try self.write("here is a string: '");
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try self.printValue(arg0);
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try self.write("' here is a number: ");
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@ -3653,7 +3641,7 @@ pub fn printf(self: &OutStream, arg0: i32, arg1: []const u8) %void {
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on the type:
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</p>
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{#code_begin|syntax#}
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pub fn printValue(self: &OutStream, value: var) %void {
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pub fn printValue(self: &OutStream, value: var) !void {
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const T = @typeOf(value);
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if (@isInteger(T)) {
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return self.printInt(T, value);
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@ -4582,7 +4570,7 @@ pub const TypeId = enum {
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{#code_begin|syntax#}
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const Builder = @import("std").build.Builder;
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pub fn build(b: &Builder) %void {
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pub fn build(b: &Builder) void {
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const exe = b.addExecutable("example", "example.zig");
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exe.setBuildMode(b.standardReleaseOptions());
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b.default_step.dependOn(&exe.step);
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@ -4724,7 +4712,7 @@ comptime {
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{#code_begin|exe_err#}
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const math = @import("std").math;
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const warn = @import("std").debug.warn;
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pub fn main() %void {
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pub fn main() !void {
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var byte: u8 = 255;
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byte = if (math.add(u8, byte, 1)) |result| result else |err| {
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@ -4752,7 +4740,7 @@ pub fn main() %void {
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</p>
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{#code_begin|exe#}
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const warn = @import("std").debug.warn;
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pub fn main() %void {
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pub fn main() void {
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var byte: u8 = 255;
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var result: u8 = undefined;
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@ -4861,14 +4849,12 @@ pub fn main() void {
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{#header_close#}
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{#header_open|Attempt to Unwrap Error#}
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<p>At compile-time:</p>
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{#code_begin|test_err|unable to unwrap error 'UnableToReturnNumber'#}
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{#code_begin|test_err|caught unexpected error 'UnableToReturnNumber'#}
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comptime {
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const number = getNumberOrFail() catch unreachable;
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}
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error UnableToReturnNumber;
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fn getNumberOrFail() %i32 {
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fn getNumberOrFail() !i32 {
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return error.UnableToReturnNumber;
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}
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{#code_end#}
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@ -4888,9 +4874,7 @@ pub fn main() void {
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}
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}
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error UnableToReturnNumber;
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fn getNumberOrFail() %i32 {
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fn getNumberOrFail() !i32 {
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return error.UnableToReturnNumber;
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}
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{#code_end#}
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@ -4898,7 +4882,6 @@ fn getNumberOrFail() %i32 {
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{#header_open|Invalid Error Code#}
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<p>At compile-time:</p>
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{#code_begin|test_err|integer value 11 represents no error#}
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error AnError;
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comptime {
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const err = error.AnError;
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const number = u32(err) + 10;
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@ -5298,7 +5281,7 @@ int main(int argc, char **argv) {
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{#code_begin|syntax#}
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const Builder = @import("std").build.Builder;
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pub fn build(b: &Builder) %void {
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pub fn build(b: &Builder) void {
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const obj = b.addObject("base64", "base64.zig");
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const exe = b.addCExecutable("test");
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@ -5,7 +5,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\pub fn main() !void {
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\\pub fn main() void {
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\\ @panic("oh no");
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\\}
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);
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@ -14,7 +14,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\pub fn main() !void {
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\\pub fn main() void {
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\\ const a = []i32{1, 2, 3, 4};
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\\ baz(bar(a));
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\\}
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@ -28,7 +28,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = add(65530, 10);
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\\ if (x == 0) return error.Whatever;
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@ -42,7 +41,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = sub(10, 20);
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\\ if (x == 0) return error.Whatever;
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@ -56,7 +54,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = mul(300, 6000);
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\\ if (x == 0) return error.Whatever;
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@ -70,7 +67,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = neg(-32768);
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\\ if (x == 32767) return error.Whatever;
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@ -84,7 +80,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = div(-32768, -1);
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\\ if (x == 32767) return error.Whatever;
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@ -98,7 +93,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = shl(-16385, 1);
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\\ if (x == 0) return error.Whatever;
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@ -112,7 +106,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
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\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
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\\ @import("std").os.exit(126);
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\\}
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\\error Whatever;
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\\pub fn main() !void {
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\\ const x = shl(0b0010111111111111, 3);
|
||||
\\ if (x == 0) return error.Whatever;
|
||||
|
|
@ -126,7 +119,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\ const x = shr(-16385, 1);
|
||||
\\ if (x == 0) return error.Whatever;
|
||||
|
|
@ -140,7 +132,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\ const x = shr(0b0010111111111111, 3);
|
||||
\\ if (x == 0) return error.Whatever;
|
||||
|
|
@ -154,8 +145,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\pub fn main() void {
|
||||
\\ const x = div0(999, 0);
|
||||
\\}
|
||||
\\fn div0(a: i32, b: i32) i32 {
|
||||
|
|
@ -167,7 +157,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\ const x = divExact(10, 3);
|
||||
\\ if (x == 0) return error.Whatever;
|
||||
|
|
@ -181,7 +170,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\ const x = widenSlice([]u8{1, 2, 3, 4, 5});
|
||||
\\ if (x.len == 0) return error.Whatever;
|
||||
|
|
@ -195,7 +183,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\ const x = shorten_cast(200);
|
||||
\\ if (x == 0) return error.Whatever;
|
||||
|
|
@ -209,7 +196,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\ const x = unsigned_cast(-10);
|
||||
\\ if (x == 0) return error.Whatever;
|
||||
|
|
@ -226,8 +212,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\ }
|
||||
\\ @import("std").os.exit(0); // test failed
|
||||
\\}
|
||||
\\error Whatever;
|
||||
\\pub fn main() !void {
|
||||
\\pub fn main() void {
|
||||
\\ bar() catch unreachable;
|
||||
\\}
|
||||
\\fn bar() !void {
|
||||
|
|
@ -239,7 +224,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\pub fn main() !void {
|
||||
\\pub fn main() void {
|
||||
\\ _ = bar(9999);
|
||||
\\}
|
||||
\\fn bar(x: u32) error {
|
||||
|
|
@ -251,7 +236,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\pub fn panic(message: []const u8, stack_trace: ?&@import("builtin").StackTrace) noreturn {
|
||||
\\ @import("std").os.exit(126);
|
||||
\\}
|
||||
\\error Wrong;
|
||||
\\pub fn main() !void {
|
||||
\\ var array align(4) = []u32{0x11111111, 0x11111111};
|
||||
\\ const bytes = ([]u8)(array[0..]);
|
||||
|
|
@ -274,7 +258,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) void {
|
|||
\\ int: u32,
|
||||
\\};
|
||||
\\
|
||||
\\pub fn main() !void {
|
||||
\\pub fn main() void {
|
||||
\\ var f = Foo { .int = 42 };
|
||||
\\ bar(&f);
|
||||
\\}
|
||||
|
|
|
|||
Loading…
Reference in New Issue