a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <optional>
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// template <class U> optional<T>& operator=(U&& v);
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#include <experimental/optional>
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#include <type_traits>
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#include <cassert>
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#include <memory>
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#if _LIBCPP_STD_VER > 11
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using std::experimental::optional;
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struct X
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{
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};
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#endif // _LIBCPP_STD_VER > 11
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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static_assert(std::is_assignable<optional<int>, int>::value, "");
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static_assert(std::is_assignable<optional<int>, int&>::value, "");
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static_assert(std::is_assignable<optional<int>&, int>::value, "");
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static_assert(std::is_assignable<optional<int>&, int&>::value, "");
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static_assert(std::is_assignable<optional<int>&, const int&>::value, "");
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static_assert(!std::is_assignable<const optional<int>&, const int&>::value, "");
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static_assert(!std::is_assignable<optional<int>, X>::value, "");
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{
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optional<int> opt;
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opt = 1;
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assert(static_cast<bool>(opt) == true);
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assert(*opt == 1);
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}
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{
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optional<int> opt;
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const int i = 2;
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opt = i;
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assert(static_cast<bool>(opt) == true);
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assert(*opt == i);
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}
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{
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optional<int> opt(3);
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const int i = 2;
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opt = i;
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assert(static_cast<bool>(opt) == true);
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assert(*opt == i);
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}
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{
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optional<std::unique_ptr<int>> opt;
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opt = std::unique_ptr<int>(new int(3));
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assert(static_cast<bool>(opt) == true);
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assert(**opt == 3);
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}
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{
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optional<std::unique_ptr<int>> opt(std::unique_ptr<int>(new int(2)));
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opt = std::unique_ptr<int>(new int(3));
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assert(static_cast<bool>(opt) == true);
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assert(**opt == 3);
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}
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#endif // _LIBCPP_STD_VER > 11
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}
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