libcxx/test/std/containers/sequences/array/array.cons/deduct.fail.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 // <array>
  10 // UNSUPPORTED: c++03, c++11, c++14
  11 // UNSUPPORTED: libcpp-no-deduction-guides
  12
  13
  14 // template <class T, class... U>
  15 //   array(T, U...) -> array<T, 1 + sizeof...(U)>;
  16 //
  17 //  Requires: (is_same_v<T, U> && ...) is true. Otherwise the program is ill-formed.
  18
  19
  20 #include <array>
  21 #include <cassert>
  22 #include <cstddef>
  23
  24 // std::array is explicitly allowed to be initialized with A a = { init-list };.
  25 // Disable the missing braces warning for this reason.
  26 #include "disable_missing_braces_warning.h"
  27
  28
  29 #include "test_macros.h"
  30
  31 int main(int, char**)
  32 {
  33     {
  34     std::array arr{1,2,3L}; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'array'}}
  35     }
  36
  37   return 0;
  38 }