This component‐private struct template provides the following nested typedefs for bsl::function for a specified PROTOTYPE which must be a function type: ` argument_type ‐‐ Only if PROTOTYPE takes exactly one argument first_argument_type ‐‐ Only if PROTOTYPE takes exactly two arguments second_argument_type ‐‐ Only if PROTOTYPE takes exactly two arguments ` The C++ Standard requires that function define these typedefs for compatibility with one‐ and two‐argument legacy (now deprecated) functor adaptors. bsl::function publicly inherits from an instantiation of this template in order to conditionally declare the above nested types. This primary (unspecialized) template provides no typedefs.

Synopsis

Declared in <bslstl_function.h>

template<class PROTOTYPE>
struct Function_ArgTypes;

Specializations

Name

Description

Function_ArgTypes<RET(ARG)>

This component‐private specialization of Function_ArgTypes is for function prototypes that take exactly one argument and provides an argument_type nested typedef.

Function_ArgTypes<RET(ARG1, ARG2)>

This component‐private specialization of Function_ArgTypes is for functions that take exactly two arguments and provides first_argument_type and second_argument_type nested typedefs.

Derived Classes

Name

Description

Function_Variadic<RET(ARGS...)>

This component‐private class template contains the physical representation and provides the variadic interfaces for bsl::function (see class and component documentation for bsl::function). bsl::function publicly inherits from an instantiation of this template. This implementation class exists to 1) minimize the amount of variadic template expansion required in C++03 using the sim_cpp11_features.pl utility and 2) work around issues with the Sun CC compiler, which has trouble with argument type deduction when a template argument has a partial specialization (as Function_Variadic does). bsl::function does not have a partial specialization and delegates to the Function_Variadic base class only those parts of the interface and implementation that depend on decomposing the function prototype into a return type and variadic list of argument types.

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