mirror of
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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
269 lines
7.3 KiB
C++
269 lines
7.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// template <class... Args> T& optional<T>::emplace(Args&&... args);
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include <memory>
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#include "test_macros.h"
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#include "archetypes.hpp"
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using std::optional;
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class X
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{
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int i_;
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int j_ = 0;
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public:
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X() : i_(0) {}
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X(int i) : i_(i) {}
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X(int i, int j) : i_(i), j_(j) {}
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friend bool operator==(const X& x, const X& y)
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{return x.i_ == y.i_ && x.j_ == y.j_;}
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};
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class Y
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{
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public:
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static bool dtor_called;
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Y() = default;
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Y(int) { TEST_THROW(6);}
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~Y() {dtor_called = true;}
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};
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bool Y::dtor_called = false;
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template <class T>
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void test_one_arg() {
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using Opt = std::optional<T>;
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{
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Opt opt;
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auto & v = opt.emplace();
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(0));
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assert(&v == &*opt);
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}
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{
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Opt opt;
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auto & v = opt.emplace(1);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(1));
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assert(&v == &*opt);
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}
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{
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Opt opt(2);
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auto & v = opt.emplace();
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(0));
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assert(&v == &*opt);
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}
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{
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Opt opt(2);
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auto & v = opt.emplace(1);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(1));
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assert(&v == &*opt);
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}
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}
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template <class T>
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void test_multi_arg()
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{
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test_one_arg<T>();
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using Opt = std::optional<T>;
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{
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Opt opt;
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auto &v = opt.emplace(101, 41);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert( v == T(101, 41));
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assert(*opt == T(101, 41));
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}
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{
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Opt opt;
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auto &v = opt.emplace({1, 2, 3, 4});
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert( v == T(4)); // T sets its value to the size of the init list
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assert(*opt == T(4));
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}
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{
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Opt opt;
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auto &v = opt.emplace({1, 2, 3, 4, 5}, 6);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(static_cast<bool>(opt) == true);
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assert( v == T(5)); // T sets its value to the size of the init list
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assert(*opt == T(5)); // T sets its value to the size of the init list
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}
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}
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template <class T>
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void test_on_test_type() {
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T::reset();
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optional<T> opt;
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assert(T::alive == 0);
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{
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T::reset_constructors();
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auto &v = opt.emplace();
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::default_constructed == 1);
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assert(T::destroyed == 0);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T());
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assert(&v == &*opt);
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}
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{
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T::reset_constructors();
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auto &v = opt.emplace();
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::default_constructed == 1);
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assert(T::destroyed == 1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T());
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assert(&v == &*opt);
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}
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{
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T::reset_constructors();
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auto &v = opt.emplace(101);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::value_constructed == 1);
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assert(T::destroyed == 1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(101));
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assert(&v == &*opt);
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}
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{
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T::reset_constructors();
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auto &v = opt.emplace(-10, 99);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::value_constructed == 1);
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assert(T::destroyed == 1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(-10, 99));
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assert(&v == &*opt);
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}
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{
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T::reset_constructors();
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auto &v = opt.emplace(-10, 99);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::value_constructed == 1);
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assert(T::destroyed == 1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(-10, 99));
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assert(&v == &*opt);
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}
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{
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T::reset_constructors();
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auto &v = opt.emplace({-10, 99, 42, 1});
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::value_constructed == 1);
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assert(T::destroyed == 1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(4)); // size of the initializer list
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assert(&v == &*opt);
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}
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{
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T::reset_constructors();
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auto &v = opt.emplace({-10, 99, 42, 1}, 42);
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static_assert( std::is_same_v<T&, decltype(v)>, "" );
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assert(T::alive == 1);
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assert(T::constructed == 1);
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assert(T::value_constructed == 1);
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assert(T::destroyed == 1);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(4)); // size of the initializer list
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assert(&v == &*opt);
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}
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}
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int main()
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{
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{
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test_on_test_type<TestTypes::TestType>();
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test_on_test_type<ExplicitTestTypes::TestType>();
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}
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{
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using T = int;
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test_one_arg<T>();
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test_one_arg<const T>();
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}
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{
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using T = ConstexprTestTypes::TestType;
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test_multi_arg<T>();
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}
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{
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using T = ExplicitConstexprTestTypes::TestType;
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test_multi_arg<T>();
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}
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{
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using T = TrivialTestTypes::TestType;
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test_multi_arg<T>();
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}
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{
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using T = ExplicitTrivialTestTypes::TestType;
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test_multi_arg<T>();
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}
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{
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optional<const int> opt;
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auto &v = opt.emplace(42);
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static_assert( std::is_same_v<const int&, decltype(v)>, "" );
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assert(*opt == 42);
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assert( v == 42);
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opt.emplace();
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assert(*opt == 0);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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Y::dtor_called = false;
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{
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Y y;
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optional<Y> opt(y);
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try
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{
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assert(static_cast<bool>(opt) == true);
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assert(Y::dtor_called == false);
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auto &v = opt.emplace(1);
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static_assert( std::is_same_v<Y&, decltype(v)>, "" );
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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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assert(Y::dtor_called == true);
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}
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}
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#endif
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}
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