template non-type parameter 非类型参数

来源：互联网发布：贴片机编程技术视频编辑：程序博客网时间：2024/05/18 02:46

CUDA v6.5 sample->0_simple->matrixMul 中看到语法：

template <int BLOCK_SIZE> __global__ voidmatrixMulCUDA(float *C, float *A, float *B, int wA, int wB){    // function body}

对于用法：

template <typename \ class>

是很常见的，但对于用法：

template <int >

却少见。

It's perfectly possible to template a class on an integer rather than a type. We can assign the templated value to a variable, or otherwise manipulate in a way we might with any other integer literal:

unsigned int x = N;

In fact, we can create algorithms which evaluate at compile time (from Wikipedia):

template <int N>struct Factorial {     enum { value = N * Factorial<N - 1>::value };};template <>struct Factorial<0> {    enum { value = 1 };};// Factorial<4>::value == 24// Factorial<0>::value == 1void foo(){    int x = Factorial<4>::value; // == 24    int y = Factorial<0>::value; // == 1}

使用 int 类型模板，可以在编译时确定。例如：

template<unsigned int S>struct Vector {    unsigned char bytes[S];};// pass 3 as argument.Vector<3> test;

更多内容可参考： http://stackoverflow.com/questions/499106/what-does-template-unsigned-int-n-mean

http://stackoverflow.com/questions/24790287/templates-int-t-c

0 0