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        如何在 C++ 中初始化私有静态常量映射?

        时间:2023-12-02

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                  本文介绍了如何在 C++ 中初始化私有静态常量映射?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我只需要字典或关联数组 string => int.

                  I need just dictionary or associative array string => int.

                  这种情况下有类型映射 C++.

                  There is type map C++ for this case.

                  但我只需要一张地图用于所有实例(-> 静态),而这张地图无法更改(-> const);

                  But I need only one map forall instances(-> static) and this map can't be changed(-> const);

                  我在 boost 库中找到了这种方式

                  I have found this way with boost library

                   std::map<int, char> example = 
                        boost::assign::map_list_of(1, 'a') (2, 'b') (3, 'c');
                  

                  没有这个库还有其他解决方案吗?我试过这样的事情,但地图初始化总是有一些问题.

                  Is there other solution without this lib? I have tried something like this, but there are always some issues with map initialization.

                  class myClass{
                  private:
                      static map<int,int> create_map()
                          {
                            map<int,int> m;
                            m[1] = 2;
                            m[3] = 4;
                            m[5] = 6;
                            return m;
                          }
                      static map<int,int> myMap =  create_map();
                  
                  };
                  

                  推荐答案

                  #include <map>
                  using namespace std;
                  
                  struct A{
                      static map<int,int> create_map()
                          {
                            map<int,int> m;
                            m[1] = 2;
                            m[3] = 4;
                            m[5] = 6;
                            return m;
                          }
                      static const map<int,int> myMap;
                  
                  };
                  
                  const map<int,int> A:: myMap =  A::create_map();
                  
                  int main() {
                  }
                  

                  这篇关于如何在 C++ 中初始化私有静态常量映射?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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