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Showing content from https://cplusplus.github.io/LWG/issue2196 below:

Specification of is_*[copy/move]_[constructible/assignable] unclear for non-referencable types

Template Condition Preconditions template <class T>
struct is_copy_constructible; For a referenceable type T, the same result as
is_constructible<T,
const T&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. template <class T>
struct is_move_constructible; For a referenceable type T, the same result as
is_constructible<T,
T&&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. … template <class T>
struct is_copy_assignable; For a referenceable type T, the same result as
is_assignable<T&,
const T&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. template <class T>
struct is_move_assignable; For a referenceable type T, the same result as
is_assignable<T&,
T&&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. … template <class T>
struct is_trivially_copy_constructible; For a referenceable type T, the same result as
is_trivially_constructible<T,
const T&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. template <class T>
struct is_trivially_move_constructible; For a referenceable type T, the same result as
is_trivially_constructible<T,
T&&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. … template <class T>
struct is_trivially_copy_assignable; For a referenceable type T, the same result as
is_trivially_assignable<T&,
const T&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. template <class T>
struct is_trivially_move_assignable; For a referenceable type T, the same result as
is_trivially_assignable<T&,
T&&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. … template <class T>
struct is_nothrow_copy_constructible; For a referenceable type T, the same result as
is_nothrow_constructible<T,
const T&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. template <class T>
struct is_nothrow_move_constructible; For a referenceable type T, the same result as
is_nothrow_constructible<T,
T&&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. … template <class T>
struct is_nothrow_copy_assignable; For a referenceable type T, the same result as
is_nothrow_assignable<T&,
const T&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound. template <class T>
struct is_nothrow_move_assignable; For a referenceable type T, the same result as
is_nothrow_assignable<T&,
T&&>::value is true , otherwise false. T shall be a complete type,
(possibly cv-qualified) void, or an
array of unknown bound.

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