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#### Callable Object

###### Description

A pointer to a function, a pointer to member function, a pointer to member data, or a class type whose objects can appear immediately to the left of a function call operator.

###### Models

- function pointer types
- member (function or data) pointer types
- all kinds of function objects

###### Examples

    & a_free_function
    & a_class::a_static_member_function
    & a_class::a_nonstatic_data_member
    & a_class::a_nonstatic_member_function
    std::less<int>()
    // using namespace boost;
    bind(std::less<int>(), _1, 5)
    lambda::_1 += lambda::_2;
    fusion::make_fused_function_object(std::less<int>())