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davamix/Derived.cpp

Last active January 2, 2018 02:08
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Is possible to move the implementation of Run function from Derived.h to Derived.cpp?
Raw
abstract.cpp
#include "IBase.h"
#include "Derived.h"
int main(){
Derived d;
d.Run();
}
Raw
Derived.cpp
#include <iostream>
#include "IBase.h"
#include "Derived.h"
void Derived::IBase::Run(){
std::cout << "Hello from derived" << std::endl;
}
Raw
Derived.h
#ifndef DERIVED_H
#define DERIVED_H
#include <iostream>
class Derived : public IBase{
public:
// void Run(){
// std::cout << "Hello from derived" << std::endl;
// }
~Derived(){}
void Run();
};
#endif
Raw
error.txt
/tmp/cckxMhvH.o: In function `main':
abstract.cpp:(.text+0x19): undefined reference to `vtable for Derived'
abstract.cpp:(.text+0x29): undefined reference to `Derived::Run()'
/tmp/cckxMhvH.o: In function `Derived::~Derived()':
abstract.cpp:(.text._ZN7DerivedD2Ev[_ZN7DerivedD5Ev]+0xd): undefined reference to `vtable for Derived'
collect2: error: ld returned 1 exit status
Raw
IBase.h
#ifndef IBASE_H
#define IBASE_H
class IBase{
public:
virtual ~IBase(){}
virtual void Run() = 0;
};
#endif
@davamix
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davamix commented Jan 2, 2018

Possibly related: https://stackoverflow.com/questions/3749099/why-should-the-implementation-and-the-declaration-of-a-template-class-be-in-the

@davamix
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davamix commented Jan 2, 2018

https://stackoverflow.com/a/16493574

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