| ... | ... | @@ -345,3 +345,69 @@ test "std.meta.trait.isContainer" { |
| 345 | 345 | testing.expect(isContainer(TestEnum)); |
| 346 | 346 | testing.expect(!isContainer(u8)); |
| 347 | 347 | } |
| 348 | |
| 349 | pub fn hasDecls(comptime T: type, comptime names: var) bool { |
| 350 | inline for (names) |name| { |
| 351 | if (!@hasDecl(T, name)) |
| 352 | return false; |
| 353 | } |
| 354 | return true; |
| 355 | } |
| 356 | |
| 357 | test "std.meta.trait.hasDecls" { |
| 358 | const TestStruct1 = struct {}; |
| 359 | const TestStruct2 = struct { |
| 360 | pub var a: u32; |
| 361 | pub var b: u32; |
| 362 | c: bool, |
| 363 | pub fn useless() void {} |
| 364 | }; |
| 365 | |
| 366 | testing.expect(!hasDecls(TestStruct1, .{"a"})); |
| 367 | testing.expect(hasDecls(TestStruct2, .{"a", "b"})); |
| 368 | testing.expect(hasDecls(TestStruct2, .{"a", "b", "useless"})); |
| 369 | testing.expect(!hasDecls(TestStruct2, .{"a", "b", "c"})); |
| 370 | } |
| 371 | |
| 372 | pub fn hasFields(comptime T: type, comptime names: var) bool { |
| 373 | inline for (names) |name| { |
| 374 | if (!@hasField(T, name)) |
| 375 | return false; |
| 376 | } |
| 377 | return true; |
| 378 | } |
| 379 | |
| 380 | test "std.meta.trait.hasFields" { |
| 381 | const TestStruct1 = struct {}; |
| 382 | const TestStruct2 = struct { |
| 383 | a: u32, |
| 384 | b: u32, |
| 385 | c: bool, |
| 386 | pub fn useless() void {} |
| 387 | }; |
| 388 | |
| 389 | testing.expect(!hasFields(TestStruct1, .{"a"})); |
| 390 | testing.expect(hasFields(TestStruct2, .{"a", "b"})); |
| 391 | testing.expect(hasFields(TestStruct2, .{"a", "b", "c"})); |
| 392 | testing.expect(!hasFields(TestStruct2, .{"a", "b", "useless"})); |
| 393 | } |
| 394 | |
| 395 | pub fn hasFunctions(comptime T: type, comptime names: var) bool { |
| 396 | inline for (names) |name| { |
| 397 | if (!hasFn(name)(T)) |
| 398 | return false; |
| 399 | } |
| 400 | return true; |
| 401 | } |
| 402 | |
| 403 | test "std.meta.trait.hasFunctions" { |
| 404 | const TestStruct1 = struct {}; |
| 405 | const TestStruct2 = struct { |
| 406 | pub fn a() void {} |
| 407 | fn b() void {} |
| 408 | }; |
| 409 | |
| 410 | testing.expect(!hasFunctions(TestStruct1, .{"a"})); |
| 411 | testing.expect(hasFunctions(TestStruct2, .{"a", "b"})); |
| 412 | testing.expect(!hasFunctions(TestStruct2, .{"a", "b", "c"})); |
| 413 | } |
data-man <datamanrb@gmail.com> 2020-05-27 04:00:38+05:00
lib