1.元素初始化:
通常初始都会用具体的值和向量,但是Thrust 提供了一些其他的初始化方法。
2.代码:
#include "cuda_runtime.h" #include "device_launch_parameters.h" #include <stdio.h> #include <thrust/host_vector.h> #include <thrust/device_vector.h> #include <thrust/copy.h> #include <thrust/fill.h> #include <thrust/sequence.h> #include <iostream> int main(void) { //initialize all ten integers of a device_vector to 1 thrust::device_vector<int>D(10, 1); //show the original D std::cout << "show the original D" << std::endl; for (int i = 0; i < D.size(); ++i) std::cout << "D[" << i << "]=" << D[i] << std::endl; //set the first seven elements of a vector to 9 thrust::fill(D.begin(), D.begin() + 7, 9); std::cout << "show the fill D" << std::endl; for (int i = 0; i < D.size(); ++i) std::cout << "D[" << i << "]=" << D[i] << std::endl; //initialize a host_vector with the first five elements of D thrust::host_vector<int>H(D.begin(), D.begin() + 5); //show the original H std::cout << "show the original H" << std::endl; for (int i = 0; i < H.size(); ++i) std::cout << "H[" << i << "]=" << H[i] << std::endl; //set the elements of H to 0,1,2,3,... thrust::sequence(H.begin(), H.end()); //show the sequence H std::cout << "show the sequence H " << std::endl; for (int i = 0; i < H.size(); ++i) std::cout << "H[" << i << "]=" << H[i] << std::endl; //copy all of H back to the beginning of D thrust::copy(H.begin(), H.end(), D.begin()); //print D std::cout << "show the final D" << std::endl; for (int i = 0; i < D.size(); ++i) std::cout << "D[" << i << "]=" << D[i] << std::endl; return 0; }
在本例中演示了fill,copy和sequence函数的用法。copy函数可以复制内存(主机和设备)
范围内的元素到另一个主机或者设备的内存空间。