286 lines
7.7 KiB
C++
286 lines
7.7 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++03, c++11, c++14
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// <optional>
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// template <class U> optional<T>& operator=(U&& v);
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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.h"
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using std::optional;
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struct ThrowAssign {
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static int dtor_called;
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ThrowAssign() = default;
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ThrowAssign(int) { TEST_THROW(42); }
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ThrowAssign& operator=(int) {
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TEST_THROW(42);
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}
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~ThrowAssign() { ++dtor_called; }
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};
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int ThrowAssign::dtor_called = 0;
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template <class T, class Arg = T, bool Expect = true>
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void assert_assignable() {
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static_assert(std::is_assignable<optional<T>&, Arg>::value == Expect, "");
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static_assert(!std::is_assignable<const optional<T>&, Arg>::value, "");
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}
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struct MismatchType {
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explicit MismatchType(int) {}
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explicit MismatchType(char*) {}
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explicit MismatchType(int*) = delete;
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MismatchType& operator=(int) { return *this; }
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MismatchType& operator=(int*) { return *this; }
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MismatchType& operator=(char*) = delete;
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};
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struct FromOptionalType {
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using Opt = std::optional<FromOptionalType>;
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FromOptionalType() = default;
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FromOptionalType(FromOptionalType const&) = delete;
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template <class Dummy = void>
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constexpr FromOptionalType(Opt&) { Dummy::BARK; }
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template <class Dummy = void>
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constexpr FromOptionalType& operator=(Opt&) { Dummy::BARK; return *this; }
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};
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void test_sfinae() {
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using I = TestTypes::TestType;
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using E = ExplicitTestTypes::TestType;
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assert_assignable<int>();
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assert_assignable<int, int&>();
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assert_assignable<int, int const&>();
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// Implicit test type
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assert_assignable<I, I const&>();
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assert_assignable<I, I&&>();
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assert_assignable<I, int>();
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assert_assignable<I, void*, false>();
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// Explicit test type
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assert_assignable<E, E const&>();
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assert_assignable<E, E &&>();
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assert_assignable<E, int>();
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assert_assignable<E, void*, false>();
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// Mismatch type
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assert_assignable<MismatchType, int>();
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assert_assignable<MismatchType, int*, false>();
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assert_assignable<MismatchType, char*, false>();
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// Type constructible from optional
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assert_assignable<FromOptionalType, std::optional<FromOptionalType>&, false>();
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}
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void test_with_test_type()
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{
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using T = TestTypes::TestType;
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T::reset();
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{ // to empty
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optional<T> opt;
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opt = 3;
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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::assigned == 0);
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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(3));
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}
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{ // to existing
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optional<T> opt(42);
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T::reset_constructors();
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opt = 3;
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assert(T::alive == 1);
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assert(T::constructed == 0);
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assert(T::assigned == 1);
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assert(T::value_assigned == 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(3));
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}
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{ // test default argument
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optional<T> opt;
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T::reset_constructors();
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opt = {1, 2};
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assert(T::alive == 1);
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assert(T::constructed == 2);
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assert(T::value_constructed == 1);
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assert(T::move_constructed == 1);
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assert(T::assigned == 0);
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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(1, 2));
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}
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{ // test default argument
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optional<T> opt(42);
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T::reset_constructors();
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opt = {1, 2};
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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::assigned == 1);
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assert(T::move_assigned == 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(1, 2));
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}
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{ // test default argument
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optional<T> opt;
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T::reset_constructors();
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opt = {1};
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assert(T::alive == 1);
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assert(T::constructed == 2);
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assert(T::value_constructed == 1);
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assert(T::move_constructed == 1);
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assert(T::assigned == 0);
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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(1));
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}
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{ // test default argument
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optional<T> opt(42);
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T::reset_constructors();
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opt = {};
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assert(static_cast<bool>(opt) == false);
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assert(T::alive == 0);
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assert(T::constructed == 0);
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assert(T::assigned == 0);
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assert(T::destroyed == 1);
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}
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}
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template <class T, class Value = int>
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void test_with_type() {
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{ // to empty
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optional<T> opt;
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opt = Value(3);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(3));
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}
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{ // to existing
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optional<T> opt(Value(42));
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opt = Value(3);
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(3));
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}
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{ // test const
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optional<T> opt(Value(42));
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const T t(Value(3));
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opt = t;
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(3));
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}
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{ // test default argument
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optional<T> opt;
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opt = {Value(1)};
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(1));
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}
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{ // test default argument
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optional<T> opt(Value(42));
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opt = {};
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assert(static_cast<bool>(opt) == false);
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}
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}
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template <class T>
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void test_with_type_multi() {
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test_with_type<T>();
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{ // test default argument
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optional<T> opt;
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opt = {1, 2};
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(1, 2));
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}
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{ // test default argument
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optional<T> opt(42);
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opt = {1, 2};
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assert(static_cast<bool>(opt) == true);
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assert(*opt == T(1, 2));
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}
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}
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void test_throws()
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{
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using T = ThrowAssign;
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{
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optional<T> opt;
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try {
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opt = 42;
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assert(false);
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} catch (int) {}
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assert(static_cast<bool>(opt) == false);
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}
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assert(T::dtor_called == 0);
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{
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T::dtor_called = 0;
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optional<T> opt(std::in_place);
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try {
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opt = 42;
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assert(false);
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} catch (int) {}
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assert(static_cast<bool>(opt) == true);
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assert(T::dtor_called == 0);
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}
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assert(T::dtor_called == 1);
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#endif
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}
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enum MyEnum { Zero, One, Two, Three, FortyTwo = 42 };
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using Fn = void(*)();
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// https://llvm.org/PR38638
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template <class T>
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constexpr T pr38638(T v)
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{
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std::optional<T> o;
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o = v;
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return *o + 2;
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}
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int main(int, char**)
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{
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test_sfinae();
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// Test with instrumented type
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test_with_test_type();
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// Test with various scalar types
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test_with_type<int>();
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test_with_type<MyEnum, MyEnum>();
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test_with_type<int, MyEnum>();
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test_with_type<Fn, Fn>();
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// Test types with multi argument constructors
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test_with_type_multi<ConstexprTestTypes::TestType>();
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test_with_type_multi<TrivialTestTypes::TestType>();
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// Test move only types
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{
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optional<std::unique_ptr<int>> opt;
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opt = std::unique_ptr<int>(new int(3));
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assert(static_cast<bool>(opt) == true);
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assert(**opt == 3);
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}
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{
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optional<std::unique_ptr<int>> opt(std::unique_ptr<int>(new int(2)));
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opt = std::unique_ptr<int>(new int(3));
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assert(static_cast<bool>(opt) == true);
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assert(**opt == 3);
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}
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test_throws();
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static_assert(pr38638(3) == 5, "");
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return 0;
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}
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