为什么我的C++类定义失败？

Question

main.cpp中

#include <iostream>
#include "Burrito.h"

using namespace std;

int main(){
  Burrito b;
  return 0;
}

Burrito.h

#ifndef BURRITO_H
#define BURRITO_H

class Burrito{
    public:
      Burrito();
};

#endif

Burrito.cpp

#include "Burrito.h"
#include <iostream>

Burrito::Burrito(){

}

编译和链接:

lzsb$ g++ main.cpp -o main
Undefined symbols for architecture x86_64:
  "Burrito::Burrito()", referenced from:
      _main in ccVpCr0z.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
lzsb$ 

平台:

Mac OS 10.6.8

G++ : i686-apple-darwin10 --with-gxx-include-dir=/usr/include/c++/4.2.1

Answer 1

您还需要编译该Burrito.cpp文件.编译器从每个.cpp文件创建目标文件,然后将它们链接起来.这是您的调用失败的地方,因为链接器无法Burrito在任何目标文件中找到引用的类.要修复编译器调用,只需添加即可Burrito.cpp

g++ main.cpp Burrito.cpp -o main