| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // Usage of is_trivially_constructible is broken with these compilers. |
| // See https://bugs.llvm.org/show_bug.cgi?id=31016 |
| // XFAIL: clang-3.7, apple-clang-7 && c++17 |
| |
| // <iterator> |
| |
| // class istream_iterator |
| |
| // constexpr istream_iterator(); |
| // C++17 says: If is_trivially_default_constructible_v<T> is true, then this |
| // constructor is a constexpr constructor. |
| |
| #include <iterator> |
| #include <cassert> |
| #include <string> |
| |
| #include "test_macros.h" |
| |
| struct S { S(); }; // not constexpr |
| |
| #if TEST_STD_VER > 14 |
| template <typename T, bool isTrivial = std::is_trivially_default_constructible_v<T>> |
| struct test_trivial { |
| void operator ()() const { |
| constexpr std::istream_iterator<T> it; |
| (void)it; |
| } |
| }; |
| |
| template <typename T> |
| struct test_trivial<T, false> { |
| void operator ()() const {} |
| }; |
| #endif |
| |
| |
| int main() |
| { |
| { |
| typedef std::istream_iterator<int> T; |
| T it; |
| assert(it == T()); |
| #if TEST_STD_VER >= 11 |
| constexpr T it2; |
| (void)it2; |
| #endif |
| } |
| |
| #if TEST_STD_VER > 14 |
| test_trivial<int>()(); |
| test_trivial<char>()(); |
| test_trivial<double>()(); |
| test_trivial<S>()(); |
| test_trivial<std::string>()(); |
| #endif |
| } |