C ++模板类模板功能问题 [英] C++ template class template function question

问题描述

我想在模板类B中添加一个以S作为模板参数的成员函数Y.

I want to add a member function Y that takes S as a template parameter in template class B.

template<typename t="">
class B {
public:
   template<typename s="">
   static void X(S & x);
}
</typename></typename>

如果我尝试定义

If I try to define

template<>
template<typename s="">
void B<_variant_t>::X(S & x) {
}
</typename>

或

or

<pre>
template<typename t="">
template<typename S>
void B<t>::X(S & x) {
}
</pre></t></typename>

我收到错误消息

I get an error

推荐答案

您要查找的是模板函数，而不是模板类.更确切地说，这与是否声明类模板无关.您的职能可以保持不变或成为班上的一员；此类可以是模板类，也可以不是.

回顾一些有关如何编写模板函数的示例:
http:///publib.boulder.ibm.com/infocenter/comphelp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8a.doc%2Flanguage%2Fref%2Ffunction_templates.htm [

What you are looking for is template function, not template class. More exactly, this is irrelevant if the declaring class template or not. You function can stay along or be a member of the class; and this class can be a template class or not, does not matter.

Review some samples on how to write a template function:
http://publib.boulder.ibm.com/infocenter/comphelp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8a.doc%2Flanguage%2Fref%2Ffunction_templates.htm[^].

It should be enough, but you can find tons of info if you Google for it.

—SA

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