Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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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
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>())

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