C++ Template Non-type Parameter

C++的template可以传入普通的参数，像给普通函数传入参数一样。可能平时并不多见，但这是完全可以的，因为好久没看这方面的东西，对这样的写法表示大为吃惊。也难怪，笔记本散热不好，《Effective C++》被我拿来垫笔记本了，而《More Effective C++》一直放在枕头旁边……翻了一下，书上都有提及这样的写法。

Besides the template arguments that are preceded by the class or typename keywords , which represent types, templates can also have regular typed parameters, similar to those found in functions. As an example, have a look at this class template that is used to contain sequences of elements:

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#include <iostream>
using namespace std;
 
template <class T, int N>
class mysequence {
    T memblock [N];
  public:
    void setmember (int x, T value);
    T getmember (int x);
};
 
template <class T, int N>
void mysequence<T,N>::setmember (int x, T value) {
  memblock[x]=value;
}
 
template <class T, int N>
T mysequence<T,N>::getmember (int x) {
  return memblock[x];
}
 
int main () {
  mysequence <int,5> myints;
  mysequence <double,5> myfloats;
  myints.setmember (0,100);
  myfloats.setmember (3,3.1416);
  cout << myints.getmember(0) << '\n';
  cout << myfloats.getmember(3) << '\n';
  return 0;
}

It is also possible to set default values or types for class template parameters.(设置参数的默认值也是可以的。)

相关链接：
Non-type Template Arguments
Non-type parameters for templates

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本文出自程序人生 >> C++ Template Non-type Parameter
作者：代码疯子

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