蓝桥ROS机器人之现代C++学习笔记4.2 无序容器

code•2022-4-12•C•阅读47

学习程序如下：

#include 
#include 
#include 
#include 

int main() {
    // initialized in same order
    std::unordered_map u = {
        {1, "1"},
        {3, "3"},
        {2, "2"}
    };
    std::map v = {
        {1, "1"},
        {3, "3"},
        {2, "2"}
    };
    
    // iterates in the same way
    std::cout << "std::unordered_map" << std::endl;
    for( const auto & n : u)
        std::cout << "Key:[" << n.first << "] Value:[" << n.second << "]\n";
    
    std::cout << std::endl;
    std::cout << "std::map" << std::endl;
    for( const auto & n : v)
        std::cout << "Key:[" << n.first << "] Value:[" << n.second << "]\n";
}

查资料☞无序：获取性能提升。

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