Re: How to elegantly store (and load) a string to (from) a file in binary mode?

Thanks to both of you. I was afraid that this is the case.
So anyway, I have tried to create Mystring to augment the
ability to save/load strings.
I am not too familiar with using dynamic polymorphism (inheritance)
becaused I used only static polymorphism (templates).
Anyway, for my limited purpose, I did the following tests which
I thought will be straight forward - I thought that a derived class/struct
inherite ALL the capabilities of the base class plus whatever other
capabilities I add to it. So here is a test program:

#include <string>
using namespace std;
struct Z : public string{};
struct MS : public string {
     int save() {/*statements;*/ return 0;}
     int load() {/*statements;*/ return 0;}
     };
struct X{
     MS s;
     X():s(""){}; //first failure
     }; //.\Test_2.cpp(10) : error C2664: 'MS::MS(const MS &)' : cannot convert parameter 1 from
'const char [1]' to 'const MS &'
        // Reason: cannot convert from 'const char [1]' to 'const MS'
        // No constructor could take the source type, or constructor overload resolution
was ambiguous
//*************************************
void main(int ac, char* av[])
{
Z sz; // OK
sz="z"; // failed: Z didn't inherite the operator '=', and so on
MS s1; // OK
s1="a"; // failed
MS sm("L"); // failed
sm="K"; // failed
X s2; // OK
s2.s="b"; // failed
X sa("L"); // failed
sm="L"; // failed
}

Obviously I miss something very fundamental. Especially in the simplest possible
 case of type Z, where I would think is a synonym to the type 'string'.
What is it?

Thanks,
David

"Alex Blekhman" <xfkt@oohay.moc> wrote in message news:O3ASCwS6GHA.4176@TK2MSFTNGP02.phx.gbl...