thrust::negate

template<typename T = void> struct negate : public cuda::std::negate<void>

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

The following code snippet demonstrates how to use negate to negate the elements of a device_vector of floats.

#include <thrust/device_vector.h>
#include <thrust/functional.h>
#include <thrust/sequence.h>
#include <thrust/transform.h>
...
const int N = 1000;
thrust::device_vector<float> V1(N);
thrust::device_vector<float> V2(N);

thrust::sequence(V1.begin(), V1.end(), 1);

thrust::transform(V1.begin(), V1.end(), V2.begin(),
                  thrust::negate<float>());
// V2 is now {-1, -2, -3, ..., -1000}