23 General utilities library [utilities]

23.14 Function objects [function.objects]

23.14.11 Function object binders [func.bind]

23.14.11.3 Function template bind [func.bind.bind]

In the text that follows:

template<class F, class... BoundArgs> unspecified bind(F&& f, BoundArgs&&... bound_args);

Requires: is_­constructible_­v<FD, F> shall be true. For each in BoundArgs, is_­constructible_­v<, > shall be true. INVOKE(fd, , , , ) ([func.require]) shall be a valid expression for some values , , , , where N has the value sizeof...(bound_­args). The cv-qualifiers cv of the call wrapper g, as specified below, shall be neither volatile nor const volatile.

Returns: A forwarding call wrapper g. The effect of g(, , , ) shall be

INVOKE(fd, std::forward<>(), std::forward<>(), , std::forward<>())

where the values and types of the bound arguments , , , are determined as specified below. The copy constructor and move constructor of the forwarding call wrapper shall throw an exception if and only if the corresponding constructor of FD or of any of the types throws an exception.

Throws: Nothing unless the construction of fd or of one of the values throws an exception.

Remarks: The return type shall satisfy the requirements of MoveConstructible. If all of FD and satisfy the requirements of CopyConstructible, then the return type shall satisfy the requirements of CopyConstructible. [Note: This implies that all of FD and are MoveConstructible. end note]

template<class R, class F, class... BoundArgs> unspecified bind(F&& f, BoundArgs&&... bound_args);

Requires: is_­constructible_­v<FD, F> shall be true. For each in BoundArgs, is_­constructible_­v<, > shall be true. INVOKE(fd, , , , ) shall be a valid expression for some values , , , , where N has the value sizeof...(bound_­args). The cv-qualifiers cv of the call wrapper g, as specified below, shall be neither volatile nor const volatile.

Returns: A forwarding call wrapper g. The effect of g(, , , ) shall be

INVOKE<R>(fd, std::forward<>(), std::forward<>(), , std::forward<>())

where the values and types of the bound arguments , , , are determined as specified below. The copy constructor and move constructor of the forwarding call wrapper shall throw an exception if and only if the corresponding constructor of FD or of any of the types throws an exception.

Throws: Nothing unless the construction of fd or of one of the values throws an exception.

Remarks: The return type shall satisfy the requirements of MoveConstructible. If all of FD and satisfy the requirements of CopyConstructible, then the return type shall satisfy the requirements of CopyConstructible. [Note: This implies that all of FD and are MoveConstructible. end note]

The values of the bound arguments , , , and their corresponding types , , , depend on the types derived from the call to bind and the cv-qualifiers cv of the call wrapper g as follows: