134 lines
3 KiB
Text
134 lines
3 KiB
Text
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// Testing that the compiler can select the correct template specialization
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// from different template aliasing.
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//
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// RUN: rm -rf %t
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// RUN: split-file %s %t
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// RUN: cd %t
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//
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// RUN: %clang_cc1 -std=c++20 %t/a.cppm -emit-module-interface -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 %t/b.cpp -fprebuilt-module-path=%t \
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// RUN: -fsyntax-only -verify
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//--- a.cppm
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// For template type parameters
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export module a;
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export template <class C>
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struct S {
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static constexpr bool selected = false;
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};
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export struct A {};
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export template <>
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struct S<A> {
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static constexpr bool selected = true;
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};
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export using B = A;
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// For template template parameters
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export template <template<typename> typename C>
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struct V {
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static constexpr bool selected = false;
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};
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export template <>
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struct V<S> {
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static constexpr bool selected = true;
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};
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// For template non type parameters
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export template <int X>
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struct Numbers {
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static constexpr bool selected = false;
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static constexpr int value = X;
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};
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export template<>
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struct Numbers<43> {
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static constexpr bool selected = true;
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static constexpr int value = 43;
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};
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export template <const int *>
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struct Pointers {
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static constexpr bool selected = false;
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};
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export int IntegralValue = 0;
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export template<>
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struct Pointers<&IntegralValue> {
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static constexpr bool selected = true;
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};
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export template <void *>
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struct NullPointers {
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static constexpr bool selected = false;
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};
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export template<>
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struct NullPointers<nullptr> {
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static constexpr bool selected = true;
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};
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export template<int (&)[5]>
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struct Array {
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static constexpr bool selected = false;
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};
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export int array[5];
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export template<>
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struct Array<array> {
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static constexpr bool selected = true;
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};
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//--- b.cpp
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// expected-no-diagnostics
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import a;
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// Testing for different qualifiers
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static_assert(S<B>::selected);
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static_assert(S<::B>::selected);
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static_assert(::S<B>::selected);
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static_assert(::S<::B>::selected);
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typedef A C;
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static_assert(S<C>::selected);
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static_assert(S<::C>::selected);
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static_assert(::S<C>::selected);
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static_assert(::S<::C>::selected);
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namespace D {
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C getAType();
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typedef C E;
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}
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static_assert(S<D::E>::selected);
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static_assert(S<decltype(D::getAType())>::selected);
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// Testing we can select the correct specialization for different
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// template template argument alising.
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static_assert(V<S>::selected);
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static_assert(V<::S>::selected);
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static_assert(::V<S>::selected);
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static_assert(::V<::S>::selected);
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// Testing for template non type parameters
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static_assert(Numbers<43>::selected);
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static_assert(Numbers<21 * 2 + 1>::selected);
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static_assert(Numbers<42 + 1>::selected);
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static_assert(Numbers<44 - 1>::selected);
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static_assert(Numbers<Numbers<43>::value>::selected);
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static_assert(!Numbers<44>::selected);
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static_assert(Pointers<&IntegralValue>::selected);
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static_assert(!Pointers<nullptr>::selected);
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static_assert(NullPointers<nullptr>::selected);
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static_assert(!NullPointers<(void*)&IntegralValue>::selected);
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static_assert(Array<array>::selected);
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int another_array[5];
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static_assert(!Array<another_array>::selected);
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