Linker command failed with exit code 1 C++

Question

My project setting is

Xcode 8.3 (8E162)
Language C++

My project structure is

├── README.md
├── TrollLanguage
│   ├── TokenParser.cpp
│   ├── TokenParser.hpp
│   └── main.cpp

My source code is

main.cpp

#include <iostream>
#include "TokenParser.hpp"

int main(int argc, const char * argv[]) {
    // insert code here...
    std::cout << "Hello, World!\n";
    TokenParser *tokenParser = new TokenParser();
    tokenParser->TestFunc();
    return 0;
}

TokenParser.cpp

#include "TokenParser.hpp"

void TestFunc() {
    std::cout << "can u see me?";
}
enter code here

TokenParser.hpp

#ifndef TokenParser_hpp
#define TokenParser_hpp

#include <iostream>

class TokenParser {
public:
    void TestFunc();
};

#endif /* TokenParser_hpp */

Expected behavior is

Hello, World!
can u see me?

Actual behavior is

Apple Mach-O Linker (Id) Error
"TokenParser::TestFunc()", referenced from:
Linker command failed with exit code 1(use -v to see invocation

apmccartney · Accepted Answer · 2017-04-02 05:55:01Z

1

You need to prepend the class name as part of the function definition in the implementation file. As it stands, you're defining a free function called TestFunc.

#include "TokenParser.hpp"

void TokenParser::TestFunc() {
    std::cout << "can u see me?";
}

edited Apr 2, 2017 at 5:55

answered Apr 2, 2017 at 5:53

apmccartney

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4 Comments

stories2 Over a year ago

It build success, but can't see (can u see me?)

apmccartney Over a year ago

strange. Either add std::cout << std::endl or a call to std::cout.flush() somewhere before returning from the main function

apmccartney Over a year ago

If your trouble is resolved, please accept the answer

stories2 Over a year ago

stack overflow says, wait 2 min. sorry.

Collectives™ on Stack Overflow

Linker command failed with exit code 1 C++

My project setting is

My project structure is

My source code is

main.cpp

TokenParser.cpp

TokenParser.hpp

Expected behavior is

Actual behavior is

1 Answer 1

4 Comments

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Collectives™ on Stack Overflow

My project setting is

My project structure is

My source code is

main.cpp

TokenParser.cpp

TokenParser.hpp

Expected behavior is

Actual behavior is

1 Answer 1

4 Comments

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