Question

i have a c++ project on eclipse and i can to use the string class in main file, but when i add a new file to the project I can not use any class.

I add file how: New-> Source file and select Template: Defaul c++ template source.

This is error src/Common.cpp:8:17: error: ‘string’ was not declared in this scope

and in src/AC.cpp all ok

thanks very much

Thanks larsman my simple code is:

AC.cpp -> all ok

include <iostream>
using namespace std;

int main()
{
string j = !!!Hello World!!!;
cout << j << endl; // prints !!!Hello World!!!
return 0;
}

Common.cpp -> src/Common.cpp:8:17: error: ‘string’ was not declared in this scope

#include <string>
void PrintTrace(string message)
{
    string j = !!!Hello World!!!;
cout << j << endl; // prints !!!Hello World!!!
}

both files are the same project.

Thanks

Answer 1

#include <string>

You have to include this header in all modules that use std::string.