Thread: STL Map Problem with user defined Class

are all these overloads valid ??

Code:

Var(const double val);
Var(const float val);
Var(const int val);
Var(const short val);
Var(const unsigned float val);
Var(const unsigned int val);
Var(const unsigned long val);
Var(const unsigned short val);

Edit: especially for the float and double type.

No, there are no unsigned floats.

Floats and doubles cannot be unsigned (nor can they be signed with the keyword signed).
Although, if I were you, I'd study basic templates since they would simplify much of your code.

Although, if I were you, I'd study basic templates since they would simplify much of your code.

Yes, from a cursory look at your work it seems that you simply want a class that can hold anything as its string representation.

Actually you might not even need a separate class. What you need is something to turn stuff into their string representation and back. Boost libraries have lexical_cast for that, but it wouldn't be hard to write your own with stringstreams. (The difference with the C conversion functions is that you can turn anything, including user-defined classes, into string and back as long as operators << and >> have been overloaded for them.)

Most basic (more error checks could be added):

Code:

#include <iostream>
#include <string>
#include <sstream>

template <class From, class Into>
bool convert(const From& from, Into& into)
{
    std::stringstream ss;
    ss << from;
    return ss >> into;
}

//example usage
int main()
{
    //convert long into string
    long n = 42;
    std::string s;
    convert(n, s);

    //convert string into int
    int i;
    if (convert(s, i)) {
        std::cout << "Success: " << i << '\n';
    }
    else {
        std::cout << "Failed to convert " << s << " into int.\n";
    }
}