在模板类外部的容器类型上书写模板成员函数 [英] writing templated member function over container type outside a template class

问题描述

我有一个模板类，我想在类定义之外定义一个成员函数，如下：

I have a template class where I am trying to define a member function outside class definition as follows:

class traits {
  typedef std::vector<int> container_t;
  ...other typedefs// 

};

template <class traits>
class Foo {
  typedef typename traits::container_t  container_t  
  // where container_t = std::vector <int>

  // member function to be templatized over container type
  void Initialize (container_t&);

private:
  container_t  temp;   //temp is of type std::vector<int>

};


template <typename T> 
void Foo <traits>::Initialize (T& data)  
{ 
   fill the data 
}

我想要的函数Initialize取模板容器类型 - container_t其中container_t可以是std :: vector或std :: set等等。

I want the function Initialize to take template container type -- container_t where container_t could be std::vector or std::set and so on.

但是我收到编译器错误，因为初始化（T&）的原型与

But I get compiler error as

class Foo
candidate是Initialize（container_t&）...

" prototype for Initialize (T& ) does not match any in the class Foo " " candidate is Initialize (container_t&) " ...

推荐答案

template <class traits>
void Foo<traits>::Initialize( typename traits::container_t& t ) {
  // code
}

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