cusp::constant_functor< T > Struct Template Reference

#include <functional.h>

Public Methods
_CCCL_HOST_DEVICE	constant_functor (const T val=0)
	Construct with the given constant val.
_CCCL_HOST_DEVICE T	operator() (const T &x) const
	Return the stored constant, ignoring input x.

Detailed description

template<typename T>
struct cusp::constant_functor< T >

constant_functor is a function object returns a constant value, ignores the input.

Parameters

T	is a model of Assignable, and if x is an object of type T, then x=c must be defined and must have a return type that is convertible to T.

Overview constant_functor is a function object. Specifically, it is an Adaptable Unary Function. If f(c) is an object of class constant_functor<T>, and x is an object of class T, then f(x) returns c.

Example

#include <cusp/array1d.h>
#include <cusp/functional.h>
#include <cusp/print.h>
 
int main()
{
   // create an array with 5 entries from 0 to 4
   cusp::counting_array<int> count(5);
 
   // allocate size of transformed output array
   cusp::array1d<int,cusp::host_memory> v(5, 1);
 
   // compute output vector as transform of tens
   thrust::transform(count.begin(), count.end(), v.begin(), cusp::constant_functor<int>());
 
   // v = [0, 0, 0, 0, 0]
   cusp::print(v);
}

Definition at line 434 of file functional.h.

Constructor & Destructor Documentation

constant_functor()

template<typename T >

_CCCL_HOST_DEVICE cusp::constant_functor< T >::constant_functor ( const T  val = 0 )

inline

Construct with the given constant val.

Definition at line 442 of file functional.h.

Member Function Documentation

operator()()

template<typename T >

_CCCL_HOST_DEVICE T cusp::constant_functor< T >::operator() ( const T &  x ) const

inline

Return the stored constant, ignoring input x.

Definition at line 446 of file functional.h.