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//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// constexpr optional(const optional<T>& rhs);
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "archetypes.hpp"
using std::optional;
template <class T, class ...InitArgs>
void test(InitArgs&&... args)
{
const optional<T> rhs(std::forward<InitArgs>(args)...);
bool rhs_engaged = static_cast<bool>(rhs);
optional<T> lhs = rhs;
assert(static_cast<bool>(lhs) == rhs_engaged);
if (rhs_engaged)
assert(*lhs == *rhs);
}
template <class T, class ...InitArgs>
constexpr bool constexpr_test(InitArgs&&... args)
{
static_assert( std::is_trivially_copy_constructible_v<T>, ""); // requirement
const optional<T> rhs(std::forward<InitArgs>(args)...);
optional<T> lhs = rhs;
return (lhs.has_value() == rhs.has_value()) &&
(lhs.has_value() ? *lhs == *rhs : true);
}
void test_throwing_ctor() {
#ifndef TEST_HAS_NO_EXCEPTIONS
struct Z {
Z() : count(0) {}
Z(Z const& o) : count(o.count + 1)
{ if (count == 2) throw 6; }
int count;
};
const Z z;
const optional<Z> rhs(z);
try
{
optional<Z> lhs(rhs);
assert(false);
}
catch (int i)
{
assert(i == 6);
}
#endif
}
template <class T, class ...InitArgs>
void test_ref(InitArgs&&... args)
{
const optional<T> rhs(std::forward<InitArgs>(args)...);
bool rhs_engaged = static_cast<bool>(rhs);
optional<T> lhs = rhs;
assert(static_cast<bool>(lhs) == rhs_engaged);
if (rhs_engaged)
assert(&(*lhs) == &(*rhs));
}
void test_reference_extension()
{
#if defined(_LIBCPP_VERSION) && 0 // FIXME these extensions are currently disabled.
using T = TestTypes::TestType;
T::reset();
{
T t;
T::reset_constructors();
test_ref<T&>();
test_ref<T&>(t);
assert(T::alive == 1);
assert(T::constructed == 0);
assert(T::assigned == 0);
assert(T::destroyed == 0);
}
assert(T::destroyed == 1);
assert(T::alive == 0);
{
T t;
const T& ct = t;
T::reset_constructors();
test_ref<T const&>();
test_ref<T const&>(t);
test_ref<T const&>(ct);
assert(T::alive == 1);
assert(T::constructed == 0);
assert(T::assigned == 0);
assert(T::destroyed == 0);
}
assert(T::alive == 0);
assert(T::destroyed == 1);
{
static_assert(!std::is_copy_constructible<std::optional<T&&>>::value, "");
static_assert(!std::is_copy_constructible<std::optional<T const&&>>::value, "");
}
#endif
}
int main()
{
test<int>();
test<int>(3);
static_assert(constexpr_test<int>(), "" );
static_assert(constexpr_test<int>(3), "" );
{
const optional<const int> o(42);
optional<const int> o2(o);
assert(*o2 == 42);
}
{
using T = TestTypes::TestType;
T::reset();
const optional<T> rhs;
assert(T::alive == 0);
const optional<T> lhs(rhs);
assert(lhs.has_value() == false);
assert(T::alive == 0);
}
TestTypes::TestType::reset();
{
using T = TestTypes::TestType;
T::reset();
const optional<T> rhs(42);
assert(T::alive == 1);
assert(T::value_constructed == 1);
assert(T::copy_constructed == 0);
const optional<T> lhs(rhs);
assert(lhs.has_value());
assert(T::copy_constructed == 1);
assert(T::alive == 2);
}
TestTypes::TestType::reset();
{
using namespace ConstexprTestTypes;
test<TestType>();
test<TestType>(42);
}
{
using namespace TrivialTestTypes;
test<TestType>();
test<TestType>(42);
}
{
test_throwing_ctor();
}
{
test_reference_extension();
}
{
constexpr std::optional<int> o1{4};
constexpr std::optional<int> o2 = o1;
static_assert( *o2 == 4, "" );
}
}
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