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0dc891b352
Replace the occurances of `class = std::enable_if_t<Cond>` and `typename = std::enable_if_t<Cond>` that have been identified in the previous commit with `std::enable_if_t<Cond, bool> = true`. This commit is inspired by #1174, which changed one occurance in the owner header. This commit is aimed to fix all remaining occurances.
43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
#include <gtest/gtest.h>
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#include <gsl/pointers>
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#include <memory>
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#include <type_traits>
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#include <utility>
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namespace
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{
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TEST(pointers_test, swap)
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{
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// taken from gh-1129:
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gsl::not_null<std::unique_ptr<int>> a(std::make_unique<int>(0));
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gsl::not_null<std::unique_ptr<int>> b(std::make_unique<int>(1));
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EXPECT_TRUE(*a == 0);
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EXPECT_TRUE(*b == 1);
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gsl::swap(a, b);
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EXPECT_TRUE(*a == 1);
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EXPECT_TRUE(*b == 0);
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}
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// These are regressions, should be fixed.
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struct NotMovable
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{
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NotMovable(NotMovable&&) = delete;
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NotMovable& operator=(NotMovable&&) = delete;
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};
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template <typename U, typename = void>
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static constexpr bool SwapCompilesFor = false;
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template <typename U>
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static constexpr bool
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SwapCompilesFor<U, std::void_t<decltype(gsl::swap<U>(std::declval<gsl::not_null<U>&>(),
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std::declval<gsl::not_null<U>&>()))>> =
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true;
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static_assert(!SwapCompilesFor<NotMovable>, "!SwapCompilesFor<NotMovable>");
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} // namespace
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