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const builtin = @import("builtin");
const std = @import("std");
const expect = std.testing.expect;
const HasFuncs = struct {
state: u32,
func_field: *const fn (u32) u32,
fn inc(self: *HasFuncs) void {
self.state += 1;
}
fn get(self: HasFuncs) u32 {
return self.state;
}
fn getPtr(self: *const HasFuncs) *const u32 {
return &self.state;
}
fn one(_: u32) u32 {
return 1;
}
fn two(_: u32) u32 {
return 2;
}
};
test "standard field calls" {
if (builtin.zig_backend == .stage1) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
try expect(HasFuncs.one(0) == 1);
try expect(HasFuncs.two(0) == 2);
var v: HasFuncs = undefined;
v.state = 0;
v.func_field = HasFuncs.one;
const pv = &v;
const pcv: *const HasFuncs = pv;
try expect(v.get() == 0);
v.inc();
try expect(v.state == 1);
try expect(v.get() == 1);
pv.inc();
try expect(v.state == 2);
try expect(pv.get() == 2);
try expect(v.getPtr().* == 2);
try expect(pcv.get() == 2);
try expect(pcv.getPtr().* == 2);
v.func_field = HasFuncs.one;
try expect(v.func_field(0) == 1);
try expect(pv.func_field(0) == 1);
try expect(pcv.func_field(0) == 1);
try expect(pcv.func_field(blk: {
pv.func_field = HasFuncs.two;
break :blk 0;
}) == 1);
v.func_field = HasFuncs.two;
try expect(v.func_field(0) == 2);
try expect(pv.func_field(0) == 2);
try expect(pcv.func_field(0) == 2);
}
test "@field field calls" {
if (builtin.zig_backend == .stage1) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
try expect(@field(HasFuncs, "one")(0) == 1);
try expect(@field(HasFuncs, "two")(0) == 2);
var v: HasFuncs = undefined;
v.state = 0;
v.func_field = HasFuncs.one;
const pv = &v;
const pcv: *const HasFuncs = pv;
try expect(@field(v, "get")() == 0);
@field(v, "inc")();
try expect(v.state == 1);
try expect(@field(v, "get")() == 1);
@field(pv, "inc")();
try expect(v.state == 2);
try expect(@field(pv, "get")() == 2);
try expect(@field(v, "getPtr")().* == 2);
try expect(@field(pcv, "get")() == 2);
try expect(@field(pcv, "getPtr")().* == 2);
v.func_field = HasFuncs.one;
try expect(@field(v, "func_field")(0) == 1);
try expect(@field(pv, "func_field")(0) == 1);
try expect(@field(pcv, "func_field")(0) == 1);
try expect(@field(pcv, "func_field")(blk: {
pv.func_field = HasFuncs.two;
break :blk 0;
}) == 1);
v.func_field = HasFuncs.two;
try expect(@field(v, "func_field")(0) == 2);
try expect(@field(pv, "func_field")(0) == 2);
try expect(@field(pcv, "func_field")(0) == 2);
}
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