cusp::sum_pair_functor< T > Struct Template Reference

#include <functional.h>

Inheritance diagram for cusp::sum_pair_functor< T >:

Detailed description

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

sum_pair_functor is a function object that computes the sum of a 2 element tuple.

Parameters

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

Overview

sum_pair_functor is a function object. Specifically, it is an Adaptable Unary Function. If f(c) is an object of class sum_pair_functor<T>, and x is an object of class ::cuda::std::tuple<T,T>, then f(x) returns ::cuda::std::get<0>(x) + ::cuda::std::get<1>(x).

Example

#include <cusp/array1d.h>
#include <cusp/functional.h>
#include <cusp/print.h>
 
int main()
{
   // create an array with 5 entries all containing 1
   cusp::constant_array<int> ones(5, 1);
   // create an array with 5 entries from -2 to 2
   cusp::counting_array<int> counting(5, -2);
 
   // allocate size of transformed output array
   cusp::array1d<int, cusp::host_memory> v(5, 0);
 
   // compute output vector as transform of tens
   thrust::transform(thrust::make_zip_iterator(::cuda::std::make_tuple(ones.begin(), counting.begin())),
                     thrust::make_zip_iterator(::cuda::std::make_tuple(ones.begin(), counting.begin())) + v.size(),
                     v.begin(),
                     cusp::sum_pair_functor<int>());
 
   // v = [-1, 0, 1, 2, 3]
   cusp::print(v);
}

Definition at line 807 of file functional.h.