96 lines
2.6 KiB
Zig
96 lines
2.6 KiB
Zig
const assert = @import("std").debug.assert;
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const mem = @import("std").mem;
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const reflection = @This();
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test "reflection: array, pointer, optional, error union type child" {
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comptime {
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assert(([10]u8).Child == u8);
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assert((*u8).Child == u8);
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assert((anyerror!u8).Payload == u8);
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assert((?u8).Child == u8);
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}
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}
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test "reflection: function return type, var args, and param types" {
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comptime {
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assert(@typeOf(dummy).ReturnType == i32);
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assert(!@typeOf(dummy).is_var_args);
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assert(@typeOf(dummy_varargs).is_var_args);
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assert(@typeOf(dummy).arg_count == 3);
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assert(@ArgType(@typeOf(dummy), 0) == bool);
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assert(@ArgType(@typeOf(dummy), 1) == i32);
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assert(@ArgType(@typeOf(dummy), 2) == f32);
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}
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}
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fn dummy(a: bool, b: i32, c: f32) i32 {
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return 1234;
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}
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fn dummy_varargs(args: ...) void {}
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test "reflection: struct member types and names" {
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comptime {
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assert(@memberCount(Foo) == 3);
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assert(@memberType(Foo, 0) == i32);
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assert(@memberType(Foo, 1) == bool);
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assert(@memberType(Foo, 2) == void);
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assert(mem.eql(u8, @memberName(Foo, 0), "one"));
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assert(mem.eql(u8, @memberName(Foo, 1), "two"));
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assert(mem.eql(u8, @memberName(Foo, 2), "three"));
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}
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}
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test "reflection: enum member types and names" {
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comptime {
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assert(@memberCount(Bar) == 4);
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assert(@memberType(Bar, 0) == void);
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assert(@memberType(Bar, 1) == i32);
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assert(@memberType(Bar, 2) == bool);
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assert(@memberType(Bar, 3) == f64);
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assert(mem.eql(u8, @memberName(Bar, 0), "One"));
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assert(mem.eql(u8, @memberName(Bar, 1), "Two"));
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assert(mem.eql(u8, @memberName(Bar, 2), "Three"));
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assert(mem.eql(u8, @memberName(Bar, 3), "Four"));
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}
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}
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test "reflection: @field" {
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var f = Foo{
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.one = 42,
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.two = true,
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.three = void{},
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};
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assert(f.one == f.one);
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assert(@field(f, "o" ++ "ne") == f.one);
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assert(@field(f, "t" ++ "wo") == f.two);
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assert(@field(f, "th" ++ "ree") == f.three);
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assert(@field(Foo, "const" ++ "ant") == Foo.constant);
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assert(@field(Bar, "O" ++ "ne") == Bar.One);
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assert(@field(Bar, "T" ++ "wo") == Bar.Two);
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assert(@field(Bar, "Th" ++ "ree") == Bar.Three);
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assert(@field(Bar, "F" ++ "our") == Bar.Four);
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assert(@field(reflection, "dum" ++ "my")(true, 1, 2) == dummy(true, 1, 2));
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@field(f, "o" ++ "ne") = 4;
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assert(f.one == 4);
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}
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const Foo = struct {
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const constant = 52;
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one: i32,
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two: bool,
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three: void,
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};
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const Bar = union(enum) {
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One: void,
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Two: i32,
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Three: bool,
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Four: f64,
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};
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