| // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s |
| |
| |
| // If P is an rvalue reference to a cv-unqualified template parameter |
| // and the argument is an lvalue, the type "lvalue reference to A" is |
| // used in place of A for type deduction. |
| template<typename T> struct X { }; |
| |
| template<typename T> X<T> f0(T&&); |
| |
| struct Y { }; |
| |
| template<typename T> T prvalue(); |
| template<typename T> T&& xvalue(); |
| template<typename T> T& lvalue(); |
| |
| void test_f0() { |
| X<int> xi0 = f0(prvalue<int>()); |
| X<int> xi1 = f0(xvalue<int>()); |
| X<int&> xi2 = f0(lvalue<int>()); |
| X<Y> xy0 = f0(prvalue<Y>()); |
| X<Y> xy1 = f0(xvalue<Y>()); |
| X<Y&> xy2 = f0(lvalue<Y>()); |
| } |
| |
| template<typename T> X<T> f1(const T&&); // expected-note{{candidate function [with T = int] not viable: no known conversion from 'int' to 'const int &&' for 1st argument}} \ |
| // expected-note{{candidate function [with T = Y] not viable: no known conversion from 'Y' to 'const Y &&' for 1st argument}} |
| |
| void test_f1() { |
| X<int> xi0 = f1(prvalue<int>()); |
| X<int> xi1 = f1(xvalue<int>()); |
| f1(lvalue<int>()); // expected-error{{no matching function for call to 'f1'}} |
| X<Y> xy0 = f1(prvalue<Y>()); |
| X<Y> xy1 = f1(xvalue<Y>()); |
| f1(lvalue<Y>()); // expected-error{{no matching function for call to 'f1'}} |
| } |
| |
| namespace std_example { |
| template <class T> int f(T&&); |
| template <class T> int g(const T&&); // expected-note{{candidate function [with T = int] not viable: no known conversion from 'int' to 'const int &&' for 1st argument}} |
| |
| int i; |
| int n1 = f(i); |
| int n2 = f(0); |
| int n3 = g(i); // expected-error{{no matching function for call to 'g'}} |
| } |