C++ 可以通过 const_cast 添加和移除 const 属性,可以通过 std::as_const 返回一个 reference-to-const 变量,具体例子如下:

#include <iostream>
#include <string>
#include <format>
#include <typeinfo>

int main()
const char* name_const{ "Tom" };
std::cout << std::format("type of name_const is: {}\n", typeid(name_const).name());

auto name_remove_const = const_cast<char*>(name_const);
std::cout << std::format("type of name_remove_const is: {}\n", typeid(name_remove_const).name());

auto name_add_const = const_cast<const char*>(name_remove_const);
std::cout << std::format("type of name_add_const is: {}\n", typeid(name_add_const).name());

std::string str{ "Hello world" };
const std::string& str_const_ref = std::as_const(str);
std::cout << std::format("type of str_const_ref is : {}\n", typeid(str_const_ref).name());

return 0;


type of name_const is: char const *
type of name_remove_const is: char *
type of name_add_const is: char const *
type of str_const_ref is : class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >