How to convert wstring into string?

Question

The question is how to convert wstring to string?

I have next example :

#include 
#include 

int main()
{
    std::wstr         


        

Answer 1

In case anyone else is interested: I needed a class that could be used interchangeably wherever either a string or wstring was expected. The following class convertible_string, based on dk123's solution, can be initialized with either a string, char const*, wstring or wchar_t const* and can be assigned to by or implicitly converted to either a string or wstring (so can be passed into a functions that take either).

class convertible_string
{
public:
    // default ctor
    convertible_string()
    {}

    /* conversion ctors */
    convertible_string(std::string const& value) : value_(value)
    {}
    convertible_string(char const* val_array) : value_(val_array)
    {}
    convertible_string(std::wstring const& wvalue) : value_(ws2s(wvalue))
    {}
    convertible_string(wchar_t const* wval_array) : value_(ws2s(std::wstring(wval_array)))
    {}

    /* assignment operators */
    convertible_string& operator=(std::string const& value)
    {
        value_ = value;
        return *this;
    }
    convertible_string& operator=(std::wstring const& wvalue)
    {
        value_ = ws2s(wvalue);
        return *this;
    }

    /* implicit conversion operators */
    operator std::string() const { return value_; }
    operator std::wstring() const { return s2ws(value_); }
private:
    std::string value_;
};