数组的部分模板专业化 [英] Partial template specialization for arrays
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问题描述
为此搜索,但找不到类似的问题。如果有一个请关闭这个问题。
这不是我真正的代码,只是一个例子来演示: -
Seached for this, but can't find a similar question. If there is one please close this question. This isn't my real code, just an example to demonstrate :-
#include <iostream>
// Normal template class with a destructor
template <class T> class Test
{
public:
~Test() { std::cout << "Normal \n";}
};
// Partial specialization for arrays
template<class T> class Test<T[]>
{
public:
~Test() { std::cout << "Array \n"; }
};
int main()
{
Test<int[3]> i;
}
当我编译时,数组的专用版本。如果我用
When I compile this it does not call the specialized version for arrays. If I replace the template with
template<class T> class Test<T[3]>
{
public:
~Test() { std::cout << "Array \n"; }
};
然后它会调用专业化,但我想要调用任何数组不仅仅是指定大小的数组。有没有办法写一个专门用于所有数组?
Then it does call the specialization but I want this to be called for any array not just ones of a specifed size. Is there any way to write a specialization that gets used for all arrays?
推荐答案
使用一个额外的非类型参数捕获大小:
Capture the size with an additional non-type parameter:
#include <iostream>
template <class T> class Test
{
public:
~Test() { std::cout << "Normal \n";}
};
template<class T, size_t N> class Test<T[N]>
{
public:
~Test() { std::cout << "Array " << N << '\n'; }
};
int main()
{
Test<int[3]> i; // Array 3
Test<int[5]> j; // Array 5
}
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