cpp 17 封装任意类型数据

利用c++17 variant 可以包装成任意类型数据

#include <iostream>
#include <variant>
#include <vector>
#include <string>
using namespace std;

template<typename T>
class AnyData{
public:
    AnyData(T v):m_data(v){}
    virtual ~AnyData(){}
    // T Get()
    // {
    //     try
    //     {
    //         T v = std::get<T>(m_data);
    //         return v;
    //     }
    //     catch(const std::exception& e)
    //     {
    //         std::cerr << e.what() << '\n';
    //     }
    // }
    operator T() const
    {
        try
        {
            T v = std::get<T>(m_data);
            return v;
        }
        catch(const std::exception& e)
        {
            std::cerr << e.what() << '\n';
        }
    }
private:
    std::variant<const char*, int8_t, int16_t, int32_t, int64_t, float, double, bool, std::string, std::vector<int>> m_data;
};

int main(int argc, char const *argv[])
{
    AnyData any1(100);
    std::string s = "wwww";
    AnyData any2(s);
    AnyData any3("erhyer");
    cout << any3 << endl;
    return 0;
}