如何声明模板类的模板 [英] how to declare template of template class

问题描述

如何声明模板类的模板？请参阅以下代码：

How can declare template of a template class?? see below code:

File: A.h
class A
{
    ...
    ...
};

File: B.h
template <typename U>
class B
{
    ...
    ...
};

File C.h
template <class T>
class C
{
    ...
    ...
};

File C.cpp
//In this file I am able to write template declaration for class A(non-template class)
#include "A.h"
template C<A>; //this works fine. 

How can I write the same for class B(which is a template class.)
#include "B.h"
template C<What should I write here for class B?>;

推荐答案

好吧，B也是一个模板， C< B< A>< / code>将工作。

Well, B is also a template, so something like C<B<A>> would work.

注意，一些编译器看到 >>< / code>作为移位运算符，并且需要 C 。

Note that some compilers see >> as a shift operator, and requires C<B<A> >.

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