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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: c++03, c++11, c++14
// <optional>
// constexpr optional(const T& v);
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "archetypes.h"
using std::optional;
int main(int, char**)
{
{
typedef int T;
constexpr T t(5);
constexpr optional<T> opt(t);
static_assert(static_cast<bool>(opt) == true, "");
static_assert(*opt == 5, "");
struct test_constexpr_ctor
: public optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
{
typedef double T;
constexpr T t(3);
constexpr optional<T> opt(t);
static_assert(static_cast<bool>(opt) == true, "");
static_assert(*opt == 3, "");
struct test_constexpr_ctor
: public optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
{
const int x = 42;
optional<const int> o(x);
assert(*o == x);
}
{
typedef TestTypes::TestType T;
T::reset();
const T t(3);
optional<T> opt = t;
assert(T::alive == 2);
assert(T::copy_constructed == 1);
assert(static_cast<bool>(opt) == true);
assert(opt.value().value == 3);
}
{
typedef ExplicitTestTypes::TestType T;
static_assert(!std::is_convertible<T const&, optional<T>>::value, "");
T::reset();
const T t(3);
optional<T> opt(t);
assert(T::alive == 2);
assert(T::copy_constructed == 1);
assert(static_cast<bool>(opt) == true);
assert(opt.value().value == 3);
}
{
typedef ConstexprTestTypes::TestType T;
constexpr T t(3);
constexpr optional<T> opt = {t};
static_assert(static_cast<bool>(opt) == true, "");
static_assert(opt.value().value == 3, "");
struct test_constexpr_ctor
: public optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
{
typedef ExplicitConstexprTestTypes::TestType T;
static_assert(!std::is_convertible<const T&, optional<T>>::value, "");
constexpr T t(3);
constexpr optional<T> opt(t);
static_assert(static_cast<bool>(opt) == true, "");
static_assert(opt.value().value == 3, "");
struct test_constexpr_ctor
: public optional<T>
{
constexpr test_constexpr_ctor(const T&) {}
};
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
struct Z {
Z(int) {}
Z(const Z&) {throw 6;}
};
typedef Z T;
try
{
const T t(3);
optional<T> opt(t);
assert(false);
}
catch (int i)
{
assert(i == 6);
}
}
#endif
return 0;
}
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