zig/test/cases/fn.zig

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const assert = @import("std").debug.assert;
test "params" {
assert(testParamsAdd(22, 11) == 33);
}
fn testParamsAdd(a: i32, b: i32) i32 {
return a + b;
}
test "local variables" {
testLocVars(2);
}
fn testLocVars(b: i32) void {
const a: i32 = 1;
if (a + b != 3) unreachable;
}
test "void parameters" {
voidFun(1, void{}, 2, {});
}
fn voidFun(a: i32, b: void, c: i32, d: void) void {
const v = b;
const vv: void = if (a == 1) v else {};
assert(a + c == 3);
return vv;
}
test "mutable local variables" {
var zero : i32 = 0;
assert(zero == 0);
var i = i32(0);
while (i != 3) {
i += 1;
}
assert(i == 3);
}
test "separate block scopes" {
{
const no_conflict : i32 = 5;
assert(no_conflict == 5);
}
const c = x: {
const no_conflict = i32(10);
break :x no_conflict;
};
assert(c == 10);
}
test "call function with empty string" {
acceptsString("");
}
fn acceptsString(foo: []u8) void { }
fn @"weird function name"() i32 {
return 1234;
}
test "weird function name" {
assert(@"weird function name"() == 1234);
}
test "implicit cast function unreachable return" {
wantsFnWithVoid(fnWithUnreachable);
}
fn wantsFnWithVoid(f: fn() void) void { }
fn fnWithUnreachable() noreturn {
unreachable;
}
test "function pointers" {
const fns = []@typeOf(fn1) { fn1, fn2, fn3, fn4, };
for (fns) |f, i| {
assert(f() == u32(i) + 5);
}
}
fn fn1() u32 {return 5;}
fn fn2() u32 {return 6;}
fn fn3() u32 {return 7;}
fn fn4() u32 {return 8;}
test "inline function call" {
assert(@inlineCall(add, 3, 9) == 12);
}
fn add(a: i32, b: i32) i32 { return a + b; }
test "number literal as an argument" {
numberLiteralArg(3);
comptime numberLiteralArg(3);
}
fn numberLiteralArg(a: var) void {
assert(a == 3);
}
test "assign inline fn to const variable" {
const a = inlineFn;
a();
}
inline fn inlineFn() void { }