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@ -135,8 +135,11 @@ struct negation : std::integral_constant<bool, !T::value> {}; |
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//
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// Determines whether the passed type `T` is trivially destructable.
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//
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// This metafunction is designed to be a drop-in replacement for the C++17
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// `std::is_trivially_destructible()` metafunction.
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// This metafunction is designed to be a drop-in replacement for the C++11
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// `std::is_trivially_destructible()` metafunction for platforms that have
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// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
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// fully support C++11, we check whether this yields the same result as the std
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// implementation.
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//
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// NOTE: the extensions (__has_trivial_xxx) are implemented in gcc (version >=
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// 4.3) and clang. Since we are supporting libstdc++ > 4.7, they should always
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@ -157,8 +160,11 @@ struct is_trivially_destructible |
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//
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// Determines whether the passed type `T` is trivially default constructible.
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//
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// This metafunction is designed to be a drop-in replacement for the C++17
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// `std::is_trivially_default_constructible()` metafunction.
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// This metafunction is designed to be a drop-in replacement for the C++11
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// `std::is_trivially_default_constructible()` metafunction for platforms that
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// have incomplete C++11 support (such as libstdc++ 4.x). On any platforms that
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// do fully support C++11, we check whether this yields the same result as the
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// std implementation.
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//
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// NOTE: according to the C++ standard, Section: 20.15.4.3 [meta.unary.prop]
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// "The predicate condition for a template specialization is_constructible<T,
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@ -199,8 +205,11 @@ struct is_trivially_default_constructible |
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//
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// Determines whether the passed type `T` is trivially copy constructible.
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//
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// This metafunction is designed to be a drop-in replacement for the C++17
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// `std::is_trivially_copy_constructible()` metafunction.
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// This metafunction is designed to be a drop-in replacement for the C++11
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// `std::is_trivially_copy_constructible()` metafunction for platforms that have
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// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
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// fully support C++11, we check whether this yields the same result as the std
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// implementation.
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//
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// NOTE: `T obj(declval<const T&>());` needs to be well-formed and not call any
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// nontrivial operation. Nontrivally destructible types will cause the
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@ -221,8 +230,11 @@ struct is_trivially_copy_constructible |
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//
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// Determines whether the passed type `T` is trivially copy assignable.
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//
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// This metafunction is designed to be a drop-in replacement for the C++17
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// `std::is_trivially_copy_assignable()` metafunction.
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// This metafunction is designed to be a drop-in replacement for the C++11
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// `std::is_trivially_copy_assignable()` metafunction for platforms that have
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// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
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// fully support C++11, we check whether this yields the same result as the std
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// implementation.
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//
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// NOTE: `is_assignable<T, U>::value` is `true` if the expression
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// `declval<T>() = declval<U>()` is well-formed when treated as an unevaluated
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