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
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
Calls a Polymorphic Function Object with the arguments from a Sequence.
The first template parameter can be specialized explicitly to avoid copying and/or to control the const qualification of a function object.
Constructors can be called applying Boost.Functional/Factory.
template< typename Function, class Sequence > typenameresult_of::invoke_function_object<Function, Sequence>::type invoke_function_object(Function f, Sequence & s); template< typename Function, class Sequence > typenameresult_of::invoke_function_object<Function, Sequence const>::type invoke_function_object(Function f, Sequence const & s);
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
Model of Polymorphic Function Object |
The function object to call. |
|
|
Model of Forward Sequence |
The arguments. |
invoke_function_object(f,s);
Return type: Return type of f when invoked with the elements in
s as its arguments.
Semantics: Invokes f
with the elements in s
as arguments and returns the result of the call expression.
#include <boost/fusion/functional/invocation/invoke_function_object.hpp>
struct sub
{
template <typename Sig>
struct result;
template <class Self, typename T>
struct result< Self(T,T) >
{ typedef typename remove_reference<T>::type type; };
template<typename T>
T operator()(T lhs, T rhs) const
{
return lhs - rhs;
}
};
void try_it()
{
sub f;
assert(f(2,1) == invoke_function_object(f,make_vector(2,1)));
}