Overloaded operator

[shlainn]

I've got a problem trying to compile a program written in Visual C++ in MinGW/GCC. While it works in VC++, MinGW dies on this piece of code:

        ByteBuffer &operator<<(const std::string &value)
        {
	    append((uint8 *)value.c_str(), value.length());
            append((uint8)0);
            return *this;
        }

with this error:

./shared/ByteBuffer.h: In member function `ByteBuffer& ByteBuffer::operator<<(const std::string&)':
./shared/ByteBuffer.h:112: error: invalid use of undefined type `const struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
C:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stringfwd.h:56: error: declaration of `const struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
./shared/ByteBuffer.h:112: error: invalid use of undefined type `const struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
C:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stringfwd.h:56: error: declaration of `const struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >'

I don't have any idea what could be wrong (I'm kinda new to this, as you may have guessed), so any help is appreciated.

Regards,

shlainn

[Laharl]

Did you #include<string >? Also, the << and >> operators cannot be class member functions since their first input must be an istream& or ostream&, depending, rather than the invisible 'this'. They can be friend functions (and if you want to associate them with a class, should be), but they can't be member functions.

[shlainn]

Did you #include<string >?

Actually I thought so. But when I checked it wasn't there. Stupid me,

thanks for the heads up.

Shlainn

[weaknessforcats]

How are you getting this to work?

operator<< requires two arguments while your function shows only one.

Plus, in order to overload an operator one of the arguments must be a user-defined type. Yours uses str::string.

Are you sure this ever compiled?