emplace.pass.cpp
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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>
// template <class... Args> T& optional<T>::emplace(Args&&... args);
#include <optional>
#include <type_traits>
#include <cassert>
#include <memory>
#include "test_macros.h"
#include "archetypes.h"
using std::optional;
class X
{
int i_;
int j_ = 0;
public:
X() : i_(0) {}
X(int i) : i_(i) {}
X(int i, int j) : i_(i), j_(j) {}
friend bool operator==(const X& x, const X& y)
{return x.i_ == y.i_ && x.j_ == y.j_;}
};
class Y
{
public:
static bool dtor_called;
Y() = default;
Y(int) { TEST_THROW(6);}
~Y() {dtor_called = true;}
};
bool Y::dtor_called = false;
template <class T>
void test_one_arg() {
using Opt = std::optional<T>;
{
Opt opt;
auto & v = opt.emplace();
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(0));
assert(&v == &*opt);
}
{
Opt opt;
auto & v = opt.emplace(1);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(1));
assert(&v == &*opt);
}
{
Opt opt(2);
auto & v = opt.emplace();
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(0));
assert(&v == &*opt);
}
{
Opt opt(2);
auto & v = opt.emplace(1);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(1));
assert(&v == &*opt);
}
}
template <class T>
void test_multi_arg()
{
test_one_arg<T>();
using Opt = std::optional<T>;
{
Opt opt;
auto &v = opt.emplace(101, 41);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert( v == T(101, 41));
assert(*opt == T(101, 41));
}
{
Opt opt;
auto &v = opt.emplace({1, 2, 3, 4});
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert( v == T(4)); // T sets its value to the size of the init list
assert(*opt == T(4));
}
{
Opt opt;
auto &v = opt.emplace({1, 2, 3, 4, 5}, 6);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert( v == T(5)); // T sets its value to the size of the init list
assert(*opt == T(5)); // T sets its value to the size of the init list
}
}
template <class T>
void test_on_test_type() {
T::reset();
optional<T> opt;
assert(T::alive == 0);
{
T::reset_constructors();
auto &v = opt.emplace();
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::default_constructed == 1);
assert(T::destroyed == 0);
assert(static_cast<bool>(opt) == true);
assert(*opt == T());
assert(&v == &*opt);
}
{
T::reset_constructors();
auto &v = opt.emplace();
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::default_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T());
assert(&v == &*opt);
}
{
T::reset_constructors();
auto &v = opt.emplace(101);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(101));
assert(&v == &*opt);
}
{
T::reset_constructors();
auto &v = opt.emplace(-10, 99);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(-10, 99));
assert(&v == &*opt);
}
{
T::reset_constructors();
auto &v = opt.emplace(-10, 99);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(-10, 99));
assert(&v == &*opt);
}
{
T::reset_constructors();
auto &v = opt.emplace({-10, 99, 42, 1});
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(4)); // size of the initializer list
assert(&v == &*opt);
}
{
T::reset_constructors();
auto &v = opt.emplace({-10, 99, 42, 1}, 42);
static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(4)); // size of the initializer list
assert(&v == &*opt);
}
}
int main(int, char**)
{
{
test_on_test_type<TestTypes::TestType>();
test_on_test_type<ExplicitTestTypes::TestType>();
}
{
using T = int;
test_one_arg<T>();
test_one_arg<const T>();
}
{
using T = ConstexprTestTypes::TestType;
test_multi_arg<T>();
}
{
using T = ExplicitConstexprTestTypes::TestType;
test_multi_arg<T>();
}
{
using T = TrivialTestTypes::TestType;
test_multi_arg<T>();
}
{
using T = ExplicitTrivialTestTypes::TestType;
test_multi_arg<T>();
}
{
optional<const int> opt;
auto &v = opt.emplace(42);
static_assert( std::is_same_v<const int&, decltype(v)>, "" );
assert(*opt == 42);
assert( v == 42);
opt.emplace();
assert(*opt == 0);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
Y::dtor_called = false;
{
Y y;
optional<Y> opt(y);
try
{
assert(static_cast<bool>(opt) == true);
assert(Y::dtor_called == false);
auto &v = opt.emplace(1);
static_assert( std::is_same_v<Y&, decltype(v)>, "" );
assert(false);
}
catch (int i)
{
assert(i == 6);
assert(static_cast<bool>(opt) == false);
assert(Y::dtor_called == true);
}
}
#endif
return 0;
}