如何编写将模板限制为std::map和std::unordered_map的C++概念

#include <iostream>
#include <map>
#include <unordered_map>

template <typename T>
void processMap(const T& map)
{
    // 在这里对map进行处理
    for (const auto& pair : map)
    {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }
}

int main()
{
    std::map<int, std::string> myMap;
    myMap[1] = "apple";
    myMap[2] = "banana";
    myMap[3] = "orange";

    std::unordered_map<int, std::string> myUnorderedMap;
    myUnorderedMap[1] = "apple";
    myUnorderedMap[2] = "banana";
    myUnorderedMap[3] = "orange";

    processMap(myMap);  // 调用processMap函数，传入std::map
    processMap(myUnorderedMap);  // 调用processMap函数，传入std::unordered_map

    return 0;
}