//-----------------------------------------------------------------
// 计算 hash 值，返回的 hash 值数据类型是 uint64_t
#include <iostream>
#include <string>
#include <functional>
int main()
{
std::string s = "Stand back! I've got jimmies!";
std::cout << std::hash<std::string>{}(s) << '
';
}
//-----------------------------------------------------------------------------
// 功能1：给字符串添加双引号和斜杠
// 功能2：剔除字符串中的双引号和斜杠
#include <iostream>
#include <iomanip>
#include <sstream>
int main()
{
std::stringstream ss;
std::string in = "String with spaces, and embedded "quotes" too";
std::string out;
// 给字符串添加双引号和斜杠
ss << std::quoted(in);
// 剔除字符串中的双引号和斜杠
ss >> std::quoted(out);
}
//----------------------------------------------------------------------------
// std::setw() 设置缩进字符数量
// std::setfill() 设置缩进字符
std::cout << std::setw(4) << j_object << "
";
std::cout << std::setw(2) << j_array << "
";
std::cout << std::setw(1) << std::setfill(' ') << j_object << "
";
//----------------------------------------------------------------------------
// 获取 CPU 硬核数量
int max_thread_num = std::thread::hardware_concurrency();