libcxx/test/std/utilities/function.objects/func.bind_front/bind_front.verify.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // functional
  12
  13 // template <class F, class... Args>
  14 // constexpr unspecified bind_front(F&&, Args&&...);
  15
  16 #include <functional>
  17
  18 constexpr int pass(const int n) { return n; }
  19
  20 int simple(int n) { return n; }
  21
  22 template<class T>
  23 T do_nothing(T t) { return t; }
  24
  25 struct NotMoveConst
  26 {
  27     NotMoveConst(NotMoveConst &&) = delete;
  28     NotMoveConst(NotMoveConst const&) = delete;
  29
  30     NotMoveConst(int) { }
  31 };
  32
  33 void testNotMoveConst(NotMoveConst) { }
  34
  35 void f() {
  36     int n = 1;
  37     const int c = 1;
  38
  39     auto p = std::bind_front(pass, c);
  40     static_assert(p() == 1); // expected-error {{static assertion expression is not an integral constant expression}}
  41
  42     auto d = std::bind_front(do_nothing, n); // expected-error {{no matching function for call to 'bind_front'}}
  43
  44     auto t = std::bind_front(testNotMoveConst, NotMoveConst(0)); // expected-error {{no matching function for call to 'bind_front'}}
  45 }