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view gcc/testsuite/g++.dg/cpp0x/template_deduction.C @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 04ced10e8804 |
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// I, Howard Hinnant, hereby place this code in the public domain. // Test the "Augmented" template argument deduction when binding an lvalue to an rvalue reference. // { dg-do compile { target c++11 } } template <bool> struct sa; template <> struct sa<true> {}; template <class T, T v> struct integral_constant { static const T value = v; typedef T value_type; typedef integral_constant<T, v> type; }; typedef integral_constant<bool, true> true_type; typedef integral_constant<bool, false> false_type; template <class T> struct is_lvalue_reference : public integral_constant<bool, false> {}; template <class T> struct is_lvalue_reference<T&> : public integral_constant<bool, true> {}; template <class T> struct is_rvalue_reference : public integral_constant<bool, false> {}; template <class T> struct is_rvalue_reference<T&&> : public integral_constant<bool, true> {}; template <bool is_lvalue_ref, bool is_rvalue_ref, class T> void test1(T&&) { sa<is_lvalue_reference<T&&>::value == is_lvalue_ref> t1; sa<is_rvalue_reference<T&&>::value == is_rvalue_ref> t2; } template <bool is_lvalue_ref, bool is_rvalue_ref, class T> void test2(const T&&) // { dg-message "argument" } { sa<is_lvalue_reference<const T&&>::value == is_lvalue_ref> t1; sa<is_rvalue_reference<const T&&>::value == is_rvalue_ref> t2; } template <bool is_lvalue_ref, bool is_rvalue_ref, class T> void test3(T*&&) { sa<is_lvalue_reference<T*&&>::value == is_lvalue_ref> t1; sa<is_rvalue_reference<T*&&>::value == is_rvalue_ref> t2; } struct A {}; A a; A source() {return A();} A* sourcep() {return 0;} int main() { test1<true, false>(a); test1<false, true>(source()); test2<false, true>(a); // { dg-error "lvalue" } test2<false, true>(source()); test3<false, true>(&a); test3<false, true>(sourcep()); return 0; }