mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-30 18:55:01 +01:00
Richard Smith
6b28213b36
Expose C++ class templates, variable templates, alias templates, and concepts as callable values in Carbon, and map calls to them into template-id formation, mirroring how Carbon generics behave. For now, only type template parameters are supported; non-type and template template parameters produce a TODO error.
183 lines
8.1 KiB
Plaintext
183 lines
8.1 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
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// EXTRA-ARGS: --clang-arg=-std=c++20
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/template/argument_count.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/template/argument_count.carbon
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// --- templates.h
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struct A {};
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struct B {};
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template<typename T, typename U> struct TwoTypes {};
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template<typename ...T> struct TypePack {};
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template<typename, typename> concept True = true;
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// FixedSizePack<T1, T2, ..., Tn>::Inner has a template parameter pack of fixed
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// size `n`, because it's expanded to an arity of exactly `n` when instantiating
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// the enclosing template, because the inner pack mentions the outer one.
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template<typename ...T> struct FixedSizePack {
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template<True<T> ...U> struct Inner {};
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};
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// --- valid.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "templates.h";
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//@dump-sem-ir-begin
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var x: Cpp.TwoTypes(Cpp.A, Cpp.B);
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//@dump-sem-ir-end
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// --- fail_too_few_arguments.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "templates.h";
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// CHECK:STDERR: fail_too_few_arguments.carbon:[[@LINE+8]]:26: error: too few template arguments for class template 'TwoTypes' [CppInteropParseError]
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// CHECK:STDERR: 14 | var x: Cpp.TwoTypes(Cpp.A);
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// CHECK:STDERR: | ^
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// CHECK:STDERR: fail_too_few_arguments.carbon:[[@LINE-5]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./templates.h:5:41: note: template is declared here [CppInteropParseNote]
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// CHECK:STDERR: 5 | template<typename T, typename U> struct TwoTypes {};
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// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
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// CHECK:STDERR:
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var x: Cpp.TwoTypes(Cpp.A);
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// --- fail_too_many_arguments.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "templates.h";
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// CHECK:STDERR: fail_too_many_arguments.carbon:[[@LINE+8]]:40: error: too many template arguments for class template 'TwoTypes' [CppInteropParseError]
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// CHECK:STDERR: 14 | var x: Cpp.TwoTypes(Cpp.A, Cpp.A, Cpp.A);
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// CHECK:STDERR: | ~~^
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// CHECK:STDERR: fail_too_many_arguments.carbon:[[@LINE-5]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./templates.h:5:41: note: template is declared here [CppInteropParseNote]
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// CHECK:STDERR: 5 | template<typename T, typename U> struct TwoTypes {};
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// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
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// CHECK:STDERR:
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var x: Cpp.TwoTypes(Cpp.A, Cpp.A, Cpp.A);
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// --- pack.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "templates.h";
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//@dump-sem-ir-begin
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var a0: Cpp.TypePack();
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var a1: Cpp.TypePack(Cpp.A);
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var a2: Cpp.TypePack(Cpp.A, Cpp.A);
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var a3: Cpp.TypePack(Cpp.A, Cpp.A, Cpp.A);
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//@dump-sem-ir-end
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// --- fixed_size_pack.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "templates.h";
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var x: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B);
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// --- fail_fixed_size_pack_wrong_size.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "templates.h";
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// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE+8]]:57: error: too few template arguments for class template 'Inner' [CppInteropParseError]
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// CHECK:STDERR: 14 | var too_few: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B);
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// CHECK:STDERR: | ^
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// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE-5]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./templates.h:15:33: note: template is declared here [CppInteropParseNote]
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// CHECK:STDERR: 15 | template<True<T> ...U> struct Inner {};
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// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~ ^
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// CHECK:STDERR:
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var too_few: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B);
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// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE+8]]:72: error: too many template arguments for class template 'Inner' [CppInteropParseError]
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// CHECK:STDERR: 24 | var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
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// CHECK:STDERR: | ~~^
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// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE-15]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./templates.h:15:33: note: template is declared here [CppInteropParseNote]
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// CHECK:STDERR: 15 | template<True<T> ...U> struct Inner {};
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// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~ ^
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// CHECK:STDERR:
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var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
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// CHECK:STDOUT: --- valid.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %TwoTypes: type = class_type @TwoTypes [concrete]
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// CHECK:STDOUT: %pattern_type: type = pattern_type %TwoTypes [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %x.patt: %pattern_type = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %x.var: ref %TwoTypes = var %x.var_patt [concrete]
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// CHECK:STDOUT: %x: ref %TwoTypes = ref_binding x, %x.var [concrete = %x.var]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- pack.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %TypePack.49edc4.1: type = class_type @TypePack.1 [concrete]
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// CHECK:STDOUT: %pattern_type.9db866.1: type = pattern_type %TypePack.49edc4.1 [concrete]
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// CHECK:STDOUT: %TypePack.49edc4.2: type = class_type @TypePack.2 [concrete]
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// CHECK:STDOUT: %pattern_type.9db866.2: type = pattern_type %TypePack.49edc4.2 [concrete]
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// CHECK:STDOUT: %TypePack.49edc4.3: type = class_type @TypePack.3 [concrete]
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// CHECK:STDOUT: %pattern_type.9db866.3: type = pattern_type %TypePack.49edc4.3 [concrete]
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// CHECK:STDOUT: %TypePack.49edc4.4: type = class_type @TypePack.4 [concrete]
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// CHECK:STDOUT: %pattern_type.9db866.4: type = pattern_type %TypePack.49edc4.4 [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %a0.patt: %pattern_type.9db866.1 = ref_binding_pattern a0 [concrete]
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// CHECK:STDOUT: %a0.var_patt: %pattern_type.9db866.1 = var_pattern %a0.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %a0.var: ref %TypePack.49edc4.1 = var %a0.var_patt [concrete]
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// CHECK:STDOUT: %a0: ref %TypePack.49edc4.1 = ref_binding a0, %a0.var [concrete = %a0.var]
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %a1.patt: %pattern_type.9db866.2 = ref_binding_pattern a1 [concrete]
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// CHECK:STDOUT: %a1.var_patt: %pattern_type.9db866.2 = var_pattern %a1.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %a1.var: ref %TypePack.49edc4.2 = var %a1.var_patt [concrete]
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// CHECK:STDOUT: %a1: ref %TypePack.49edc4.2 = ref_binding a1, %a1.var [concrete = %a1.var]
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %a2.patt: %pattern_type.9db866.3 = ref_binding_pattern a2 [concrete]
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// CHECK:STDOUT: %a2.var_patt: %pattern_type.9db866.3 = var_pattern %a2.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %a2.var: ref %TypePack.49edc4.3 = var %a2.var_patt [concrete]
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// CHECK:STDOUT: %a2: ref %TypePack.49edc4.3 = ref_binding a2, %a2.var [concrete = %a2.var]
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %a3.patt: %pattern_type.9db866.4 = ref_binding_pattern a3 [concrete]
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// CHECK:STDOUT: %a3.var_patt: %pattern_type.9db866.4 = var_pattern %a3.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %a3.var: ref %TypePack.49edc4.4 = var %a3.var_patt [concrete]
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// CHECK:STDOUT: %a3: ref %TypePack.49edc4.4 = ref_binding a3, %a3.var [concrete = %a3.var]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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