I tried compiling a simple program on Xcode and got the following messages:
function<anonymous namespace>::Initialize' has internal linkage but is not defined
function<anonymous namespace>::HandleBadInput' has internal linkage but is not defined
Undefined symbols for architecture x86_64:
"(anonymous namespace)::Initialize()", referenced from:
_main in main.o
"(anonymous namespace)::HandleBadInput()", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
The header file looks like this:
#ifndef WJKErrorHandling
#define WJKErrorHandling
namespace WJKErrorHandling{
void Initialize(void);
int HandleBadInput(void);
}
#endif // defined(WJKErrorHandling)
the implementation file looks like this:
#include <iostream>
#include "WJKErrorHandling.h"
namespace WJKErrorHandling{
void Initialize(void){
std::cin.exceptions(std::cin.failbit);
}
int HandleBadInput(void){
std::cerr << "Input Error: wrong type?\n";
std::cin.clear();
char BadInput[5];
std::cin >> BadInput;
return 1;
}
}
and main.cpp looks like this:
#include <iostream>
#include "WJKErrorHandling.h"
void Prompt (void){
//Prompts the user to begin entering numbers
std::cout << "Begin entering numbers: \n";
}
float GetNumber (void){
std::cout << "Number: \n";
float Number;
std::cin >> Number;
return Number;
}
std::string GetString (void){
std::cout << "String: \n";
std::string String;
std::cin >> String;
return String;
}
int main()
{
Prompt();
WJKErrorHandling::Initialize();
int ReturnCode = 0;
try{
float Number = GetNumber();
std::cout << Number;
std::string String = GetString();
std::cout << String;
std::cout << "SUCCESS!!!!\n";
}
catch(...){
ReturnCode = WJKErrorHandling::HandleBadInput();
}
return ReturnCode;
}
I’ve tried finding an answer so far, but I haven’t understood any of the posts that I’ve found. I’m new with C++, so any help would be greatly appreciated!
Your #define Guard is causing name lookup issue.
change to below style should fix the issue: