将std :: map直接插入std :: vector [英] Insert std::map into std::vector directly

问题描述

对不起，如果这个问题很琐碎。

Sorry if the question is very trivial.

我有一个地图矢量：

typedef map<char, int> edges;
typedef vector<edges> nodes;

nodes n;

现在，假设我想推动玩具的发展。我尝试了不同的事情，而我的工作是

Now let's say I want to push a toy edge. I tried different things and what I worked is

edges e;        //declare an edge
e['c'] = 1;     //initialize it
n.push_back(e);  //push it to the vector

我怎样才能将一对边的值（' c'和2），而不必声明变量并对其进行初始化？

How can I just push the pair of values of an edge ('c' and 2) without having to declare a variable and initialize it?

类似的东西：

n.push_back(edges('c',2));

但是编译器给出错误

error: no matching function for call to ‘std::map<char, int>::map(char, int)’

推荐答案

您可以列出初始化：

nodes vec {
    { {'a', 12}, {'b', 32} },
    { {'c', 77} },
};

vec.push_back(
        { {'d', 88}, {'e', 99} }
        );

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