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Diffstat (limited to 'test/std/utilities/optional/optional.specalg/swap.pass.cpp')
| -rw-r--r-- | test/std/utilities/optional/optional.specalg/swap.pass.cpp | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/test/std/utilities/optional/optional.specalg/swap.pass.cpp b/test/std/utilities/optional/optional.specalg/swap.pass.cpp new file mode 100644 index 000000000000..31779243e32a --- /dev/null +++ b/test/std/utilities/optional/optional.specalg/swap.pass.cpp @@ -0,0 +1,352 @@ +//===----------------------------------------------------------------------===// +// +// 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> + +// template <class T> void swap(optional<T>& x, optional<T>& y) +// noexcept(noexcept(x.swap(y))); + +#include <optional> +#include <type_traits> +#include <cassert> + +#include "test_macros.h" +#include "archetypes.hpp" + +using std::optional; + +class X +{ + int i_; +public: + static unsigned dtor_called; + X(int i) : i_(i) {} + X(X&& x) = default; + X& operator=(X&&) = default; + ~X() {++dtor_called;} + + friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;} +}; + +unsigned X::dtor_called = 0; + +class Y +{ + int i_; +public: + static unsigned dtor_called; + Y(int i) : i_(i) {} + Y(Y&&) = default; + ~Y() {++dtor_called;} + + friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;} + friend void swap(Y& x, Y& y) {std::swap(x.i_, y.i_);} +}; + +unsigned Y::dtor_called = 0; + +class Z +{ + int i_; +public: + Z(int i) : i_(i) {} + Z(Z&&) { TEST_THROW(7);} + + friend constexpr bool operator==(const Z& x, const Z& y) {return x.i_ == y.i_;} + friend void swap(Z&, Z&) { TEST_THROW(6);} +}; + + +struct NonSwappable { + NonSwappable(NonSwappable const&) = delete; +}; +void swap(NonSwappable&, NonSwappable&) = delete; + +void test_swap_sfinae() { + using std::optional; + { + using T = TestTypes::TestType; + static_assert(std::is_swappable_v<optional<T>>, ""); + } + { + using T = TestTypes::MoveOnly; + static_assert(std::is_swappable_v<optional<T>>, ""); + } + { + using T = TestTypes::Copyable; + static_assert(std::is_swappable_v<optional<T>>, ""); + } + { + using T = TestTypes::NoCtors; + static_assert(!std::is_swappable_v<optional<T>>, ""); + } + { + using T = NonSwappable; + static_assert(!std::is_swappable_v<optional<T>>, ""); + } + { + // Even thought CopyOnly has deleted move operations, those operations + // cause optional<CopyOnly> to have implicitly deleted move operations + // that decay into copies. + using T = TestTypes::CopyOnly; + using Opt = optional<T>; + T::reset(); + Opt L(101), R(42); + T::reset_constructors(); + std::swap(L, R); + assert(L->value == 42); + assert(R->value == 101); + assert(T::copy_constructed == 1); + assert(T::constructed == T::copy_constructed); + assert(T::assigned == 2); + assert(T::assigned == T::copy_assigned); + } +} + +int main() +{ + test_swap_sfinae(); + { + optional<int> opt1; + optional<int> opt2; + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + } + { + optional<int> opt1(1); + optional<int> opt2; + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == false); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 1); + } + { + optional<int> opt1; + optional<int> opt2(2); + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 2); + assert(static_cast<bool>(opt2) == false); + } + { + optional<int> opt1(1); + optional<int> opt2(2); + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 2); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 1); + } + { + optional<X> opt1; + optional<X> opt2; + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + assert(X::dtor_called == 0); + } + { + optional<X> opt1(1); + optional<X> opt2; + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == false); + X::dtor_called = 0; + swap(opt1, opt2); + assert(X::dtor_called == 1); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 1); + } + { + optional<X> opt1; + optional<X> opt2(2); + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + X::dtor_called = 0; + swap(opt1, opt2); + assert(X::dtor_called == 1); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 2); + assert(static_cast<bool>(opt2) == false); + } + { + optional<X> opt1(1); + optional<X> opt2(2); + static_assert(noexcept(swap(opt1, opt2)) == true, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + X::dtor_called = 0; + swap(opt1, opt2); + assert(X::dtor_called == 1); // from inside std::swap + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 2); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 1); + } + { + optional<Y> opt1; + optional<Y> opt2; + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + assert(Y::dtor_called == 0); + } + { + optional<Y> opt1(1); + optional<Y> opt2; + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == false); + Y::dtor_called = 0; + swap(opt1, opt2); + assert(Y::dtor_called == 1); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 1); + } + { + optional<Y> opt1; + optional<Y> opt2(2); + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + Y::dtor_called = 0; + swap(opt1, opt2); + assert(Y::dtor_called == 1); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 2); + assert(static_cast<bool>(opt2) == false); + } + { + optional<Y> opt1(1); + optional<Y> opt2(2); + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + Y::dtor_called = 0; + swap(opt1, opt2); + assert(Y::dtor_called == 0); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 2); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 1); + } + { + optional<Z> opt1; + optional<Z> opt2; + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + swap(opt1, opt2); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == false); + } +#ifndef TEST_HAS_NO_EXCEPTIONS + { + optional<Z> opt1; + opt1.emplace(1); + optional<Z> opt2; + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == false); + try + { + swap(opt1, opt2); + assert(false); + } + catch (int i) + { + assert(i == 7); + } + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == false); + } + { + optional<Z> opt1; + optional<Z> opt2; + opt2.emplace(2); + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + try + { + swap(opt1, opt2); + assert(false); + } + catch (int i) + { + assert(i == 7); + } + assert(static_cast<bool>(opt1) == false); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + } + { + optional<Z> opt1; + opt1.emplace(1); + optional<Z> opt2; + opt2.emplace(2); + static_assert(noexcept(swap(opt1, opt2)) == false, ""); + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + try + { + swap(opt1, opt2); + assert(false); + } + catch (int i) + { + assert(i == 6); + } + assert(static_cast<bool>(opt1) == true); + assert(*opt1 == 1); + assert(static_cast<bool>(opt2) == true); + assert(*opt2 == 2); + } +#endif // TEST_HAS_NO_EXCEPTIONS +} |