| ... | ... | @@ -341,3 +341,78 @@ test "std.meta.trait.isContainer" { |
| 341 | 341 | testing.expect(isContainer(TestEnum)); |
| 342 | 342 | testing.expect(!isContainer(u8)); |
| 343 | 343 | } |
| 344 | |
| 345 | pub fn hasDecls(comptime T: type, comptime names: var) bool { |
| 346 | inline for (names) |name| { |
| 347 | if (!@hasDecl(T, name)) |
| 348 | return false; |
| 349 | } |
| 350 | return true; |
| 351 | } |
| 352 | |
| 353 | test "std.meta.trait.hasDecls" { |
| 354 | const TestStruct1 = struct {}; |
| 355 | const TestStruct2 = struct { |
| 356 | pub var a: u32; |
| 357 | pub var b: u32; |
| 358 | c: bool, |
| 359 | pub fn useless() void {} |
| 360 | }; |
| 361 | |
| 362 | const tuple = .{ "a", "b", "c" }; |
| 363 | |
| 364 | testing.expect(!hasDecls(TestStruct1, .{"a"})); |
| 365 | testing.expect(hasDecls(TestStruct2, .{ "a", "b" })); |
| 366 | testing.expect(hasDecls(TestStruct2, .{ "a", "b", "useless" })); |
| 367 | testing.expect(!hasDecls(TestStruct2, .{ "a", "b", "c" })); |
| 368 | testing.expect(!hasDecls(TestStruct2, tuple)); |
| 369 | } |
| 370 | |
| 371 | pub fn hasFields(comptime T: type, comptime names: var) bool { |
| 372 | inline for (names) |name| { |
| 373 | if (!@hasField(T, name)) |
| 374 | return false; |
| 375 | } |
| 376 | return true; |
| 377 | } |
| 378 | |
| 379 | test "std.meta.trait.hasFields" { |
| 380 | const TestStruct1 = struct {}; |
| 381 | const TestStruct2 = struct { |
| 382 | a: u32, |
| 383 | b: u32, |
| 384 | c: bool, |
| 385 | pub fn useless() void {} |
| 386 | }; |
| 387 | |
| 388 | const tuple = .{ "a", "b", "c" }; |
| 389 | |
| 390 | testing.expect(!hasFields(TestStruct1, .{"a"})); |
| 391 | testing.expect(hasFields(TestStruct2, .{ "a", "b" })); |
| 392 | testing.expect(hasFields(TestStruct2, .{ "a", "b", "c" })); |
| 393 | testing.expect(hasFields(TestStruct2, tuple)); |
| 394 | testing.expect(!hasFields(TestStruct2, .{ "a", "b", "useless" })); |
| 395 | } |
| 396 | |
| 397 | pub fn hasFunctions(comptime T: type, comptime names: var) bool { |
| 398 | inline for (names) |name| { |
| 399 | if (!hasFn(name)(T)) |
| 400 | return false; |
| 401 | } |
| 402 | return true; |
| 403 | } |
| 404 | |
| 405 | test "std.meta.trait.hasFunctions" { |
| 406 | const TestStruct1 = struct {}; |
| 407 | const TestStruct2 = struct { |
| 408 | pub fn a() void {} |
| 409 | fn b() void {} |
| 410 | }; |
| 411 | |
| 412 | const tuple = .{ "a", "b", "c" }; |
| 413 | |
| 414 | testing.expect(!hasFunctions(TestStruct1, .{"a"})); |
| 415 | testing.expect(hasFunctions(TestStruct2, .{ "a", "b" })); |
| 416 | testing.expect(!hasFunctions(TestStruct2, .{ "a", "b", "c" })); |
| 417 | testing.expect(!hasFunctions(TestStruct2, tuple)); |
| 418 | } |
Andrew Kelley <andrew@ziglang.org> 2020-06-01 14:50:01-04:00
GitHub <noreply@github.com> 2020-06-01 14:50:01-04:00
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