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b9231a2326
This patch fixes PR30260 by using a (void*) cast on the placement argument to placement new to casts away the const. See also http://llvm.org/PR30260. As a drive by change this patch also changes the header guard for <experimental/optional> to _LIBCPP_EXPERIMENTAL_OPTIONAL from _LIBCPP_OPTIONAL. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@280775 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
2.4 KiB
C++
99 lines
2.4 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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// UNSUPPORTED: c++98, c++03, c++11
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// XFAIL: libcpp-no-exceptions
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// <optional>
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// optional<T>& operator=(const optional<T>& rhs);
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#include <experimental/optional>
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#include <type_traits>
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#include <cassert>
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using std::experimental::optional;
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struct AllowConstAssign {
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AllowConstAssign(AllowConstAssign const&) {}
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AllowConstAssign const& operator=(AllowConstAssign const&) const {
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return *this;
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}
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};
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struct X
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{
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static bool throw_now;
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X() = default;
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X(const X&)
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{
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if (throw_now)
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throw 6;
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}
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};
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bool X::throw_now = false;
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int main()
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{
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{
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optional<int> opt;
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constexpr optional<int> opt2;
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opt = opt2;
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static_assert(static_cast<bool>(opt2) == false, "");
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assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
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}
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{
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optional<const AllowConstAssign> opt;
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optional<const AllowConstAssign> opt2;
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opt = opt2;
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}
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{
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optional<int> opt;
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constexpr optional<int> opt2(2);
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opt = opt2;
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static_assert(static_cast<bool>(opt2) == true, "");
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static_assert(*opt2 == 2, "");
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assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
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assert(*opt == *opt2);
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}
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{
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optional<int> opt(3);
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constexpr optional<int> opt2;
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opt = opt2;
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static_assert(static_cast<bool>(opt2) == false, "");
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assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
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}
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{
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optional<int> opt(3);
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constexpr optional<int> opt2(2);
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opt = opt2;
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static_assert(static_cast<bool>(opt2) == true, "");
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static_assert(*opt2 == 2, "");
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assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
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assert(*opt == *opt2);
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}
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{
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optional<X> opt;
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optional<X> opt2(X{});
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assert(static_cast<bool>(opt2) == true);
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try
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{
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X::throw_now = true;
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opt = opt2;
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assert(false);
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}
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catch (int i)
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{
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assert(i == 6);
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assert(static_cast<bool>(opt) == false);
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}
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}
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}
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