模板<unsigned int N>是什么意思？

``template <class T>` `

` `template <unsigned int N>` `

4 Solutions collect form web for “模板<unsigned int N>是什么意思？”

` `unsigned int x = N;` `

` `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 == 1 void foo() { int x = Factorial<4>::value; // == 24 int y = Factorial<0>::value; // == 1 }` `

• types参数。
• types
• 模板（只有类和别名模板，没有函数或variables模板）
• 非types参数
• 指针
• 参考
• 积分常量expression式

` `template<typename T> struct Container { T t; }; // pass type "long" as argument. Container<long> test;` `

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

` `template<void (*F)()> struct FunctionWrapper { static void call_it() { F(); } }; // pass address of function do_it as argument. void do_it() { } FunctionWrapper<&do_it> test;` `

` `template<int &A> struct SillyExample { static void do_it() { A = 10; } }; // pass flag as argument int flag; SillyExample<flag> test;` `

` `template<template<typename T> class AllocatePolicy> struct Pool { void allocate(size_t n) { int *p = AllocatePolicy<int>::allocate(n); } }; // pass the template "allocator" as argument. template<typename T> struct allocator { static T * allocate(size_t n) { return 0; } }; Pool<allocator> test;` `

` `template<unsigned int SIZE = 3> struct Vector { unsigned char buffer[SIZE]; }; Vector<> test;` `

` `template<> struct Vector<3> { // alternative definition for SIZE == 3 };` `

` `template <unsigned int N> class MyArray { public: private: double data[N]; // Use N as the size of the array }; int main() { MyArray<2> a1; MyArray<2> a2; MyArray<4> b1; a1 = a2; // OK The arrays are the same size. a1 = b1; // FAIL because the size of the array is part of the // template and thus the type, a1 and b1 are different types. // Thus this is a COMPILE time failure. }` `

` `#include <cstdio> template <int I> class foo { void print() { printf("%i", I); } }; int main() { foo<26> f; f.print(); return 0; }` `

` `#include <cstdio> #define MAKE_A_FOO(I) class foo_##I \ { \ void print() \ { \ printf("%i", I); \ } \ }; MAKE_A_FOO(26) int main() { foo_26 f; f.print(); return 0; }` `

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