所有类型的 std::vector 的部分特化 [英] Partial specialization for std::vector of all types

问题描述

我不确定模板化是否走得太远，但存在以下问题:

I'm not sure whether I'm going too far with templateization, but the following problem:

我有一个容器类.这个类可以直接取值，也可以取带值的向量.我想专门针对第二种情况.

I have sort of a container class. This class can directly take values or it can take vectors which take values. I would like to specialize it for the second case.

我怎么能...

1. ...将类专门用于任何类型的向量?
2. ...在专门的类中提取向量的参数?

代码示例:

// GENERAL CASE with vector of type T
template <class T>
class Container
{

        std::vector<T> container; 

        void set(T val, int idx){
            this->container[idx] = val;
        }

};

// SPECIAL CASE with vector of vectors
template <>
class Container<std::vector<all types allowed>>
{
        std::vector<The_type_of_vector> container; 

        void set(The_type_of_vector val, int idx1, int idx2){
            this->container[idx1][idx2] = val; // set element idx2 in vector idx1
        }

};

(当然我的 Container 比这里显示的要复杂一些.我也可以创建两个不同的非模板版本的容器.但仔细想想，我也很好奇我如何通过专业化来做到这一点.)

(Of course my Container is a bit more complicated than shown here. I could also create two different non-template versions of the container. But after thinking about it, I'm also curious how I could do it with specialization.)

推荐答案

大功告成，您只需要语法即可.

You're almost there, all you need is the syntax.

// SPECIAL CASE with vector of vectors
template < typename element_type >
class Container<std::vector< element_type >>

如果你真的想支持不同的分配器，你也可以从 vector 中提取分配器类型.

You could also extract the allocator type from vector, if you actually want to support different allocators.

我不确定我是否在模板化方面做得太过分

I'm not sure whether I'm going too far with templateization

如果您可以选择是否编写模板，通常您不应该这样做.否则，这里没有任何可疑之处.

If you have a choice between writing a template or not, usually you shouldn't. Otherwise, nothing here is suspicious.

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