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std::inout_ptr - cppreference.com

template< class Pointer = void, class Smart, class... Args >
auto inout_ptr( Smart& s, Args&&... args );

Returns an inout_ptr_t with deduced template arguments that captures arguments for resetting by reference.

The program is ill-formed if construction of the return value (see below) is ill-formed.

std::inout_ptr_t<Smart, P, Args&&>(s, std::forward<Args>(args)...), where P is

• Pointer, if Pointer is not a void type, otherwise,
• Smart::pointer, if it is valid and denotes a type, otherwise,
• Smart::element_type*, if Smart::element_type is valid and denotes a type, otherwise,
• std::pointer_traits<Smart>::element_type*.

Users may specify the template argument for the template parameter Pointer, in order to interoperate with foreign functions that take a Pointer*.

As all arguments for resetting are captured by reference, the returned inout_ptr_t should be a temporary object destroyed at the end of the full-expression containing the call to the foreign function, in order to avoid dangling references.

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