Modernes C++ programmieren

// https://godbolt.org/z/M6earoWMn 
#include <iostream>
#include <string>
#include <concepts>    // copyable, C++20
template <std::copyable T>
class MyContainer {
    T data_;
public:
    void setData(const T& d) { data_ = d; } // general case
    T getData() const { return data_; }     // general case
};
template<>                                  // Specialization
void MyContainer<std::string>::setData(const std::string& d) {
    data_ = "[" + d + "]";
}
int main() {
    MyContainer<std::string> mcString;
    mcString.setData("History");
    std::cout << mcString.getData() << '\n';  // Output: [History]
    MyContainer<int> mcInt;
    mcInt.setData(5);
    std::cout << mcInt.getData() << '\n';     // Output: 5
}