I'm writing C++ code on a mac. Why do I get this error when compiling?:
Undefined symbols for architecture i386: "Log::theString", referenced from: Log::method(std::string) in libTest.a(Log.o) ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)
Not sure if my code is wrong or I have to add additional flags to Xcode. My current XCode configurations are the default ones for a 'static library' project.
My code:
Log.h------------
#include <iostream>
#include <string>
using namespace std;
class Log{
public:
static void method(string arg);
private:
static string theString ;
};
Log.cpp ----
#include "Log.h"
#include <ostream>
void Log::method(string arg){
theString = "hola";
cout << theString << endl;
}
I'm calling the 'method' from a test code, in this way: 'Log::method("asd"):'
thanks for your help.
You must define the statics in the cpp
file.
Log.cpp
#include "Log.h"
#include <ostream>
string Log::theString; // <---- define static here
void Log::method(string arg){
theString = "hola";
cout << theString << endl;
}
You should also remove using namespace std;
from the header. Get into the habit while you still can. This will pollute the global namespace with std
wherever you include the header.