1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <functional>
11
12 // template<class F>
13 // function(F) -> function<see-below>;
14
15 // UNSUPPORTED: c++03, c++11, c++14
16
17 // The deduction guides for std::function do not handle rvalue-ref qualified
18 // call operators and C-style variadics. It also doesn't deduce from nullptr_t.
19 // Make sure we stick to the specification.
20
21 #include <functional>
22 #include <type_traits>
23
24 struct R { };
operator ()f025 struct f0 { R operator()() && { return {}; } };
operator ()f126 struct f1 { R operator()(int, ...) { return {}; } };
27
main(int,char **)28 int main(int, char**) {
29 std::function f = f0{}; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'function'}}
30 std::function g = f1{}; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'function'}}
31 std::function h = nullptr; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'function'}}
32 return 0;
33 }
34