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#include <boost/tr1/functional.hpp>
or
#include <functional>
The Ref library is a small library that is useful for passing references
to function templates (algorithms) that would usually take copies of their
arguments. It defines the class template reference_wrapper<T>
,
and the two functions ref
and cref
that return instances
of reference_wrapper<T>
.
Refer to Boost.Bind for more information.
namespace std { namespace tr1 { template <class T> class reference_wrapper; template <class T> reference_wrapper<T> ref(T&); template <class T> reference_wrapper<const T> cref(const T&); template <class T> reference_wrapper<T> ref(reference_wrapper<T>); template <class T> reference_wrapper<const T> cref(reference_wrapper<T>); } // namespace tr1 } // namespace std
Configuration: Boost.Config should (automatically) define the macro BOOST_HAS_TR1_REFERENCE_WRAPPER if your standard library implements this part of TR1.
Standard Conformity: The Boost version of this this component does not currently support function call invocation (2.1.2.4), or derivation from std::unary_function or std::binary_function (2.1.2 paragraphs 3 and 4).
The Boost version is not implicitly convertible to T& as the TR requires.