forked from OSchip/llvm-project
33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only %s -std=c++98 -verify
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// expected-no-diagnostics
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// This is a test for a hack in Clang that works around an issue with libc++
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// 3.1's std::move and std::forward implementation. When emulating these
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// functions in C++98 mode, libc++ 3.1 has a "fake rvalue reference" type, and
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// std::move will return by value when given an instance of that type.
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namespace std {
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struct rv {};
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template<bool B, typename T> struct enable_if;
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template<typename T> struct enable_if<true, T> { typedef T type; };
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template<typename T> typename enable_if<__is_convertible(T, rv), T>::type move(T &);
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template<typename T> typename enable_if<!__is_convertible(T, rv), T&>::type move(T &);
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template<typename U, typename T> typename enable_if<__is_convertible(T, rv), U>::type forward(T &);
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template<typename U, typename T> typename enable_if<!__is_convertible(T, rv), U&>::type forward(T &);
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}
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struct A {};
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void f(A a, std::rv rv) {
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a = std::move(a);
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rv = std::move(rv);
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a = std::forward<A>(a);
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rv = std::forward<std::rv>(rv);
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a = std::forward<A&>(a);
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rv = std::forward<std::rv&>(rv);
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}
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