c ++“未定义的引用“Foo :: Foo(std :: string)”& [英] c++ " undefined reference to 'Foo::Foo(std::string)' "
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问题描述
我不太熟悉c ++和如何实例化对象的工作,所以这可能是一个很简单的事情来解决。当我编译g ++我得到错误未定义引用'Foo :: Foo(std :: string)'。我想创建一个类Foo的实例,在其构造函数中有一个字符串参数。以下是代码:
I'm not too familiar with c++ and how instantiating objects work, so this is probably a very simple thing to solve. When I compile with g++ I get the error " undefined reference to 'Foo::Foo(std::string)' ". I want to create an instance of the class Foo that has a string parameter in its constructor. Here is the code:
#include <string>
using namespace std;
class Foo
{
public:
Foo(string s);
private:
string id;
};
Foo.cpp
Foo.cpp
#include <string>
#include "Foo.h"
using namespace std;
Foo::Foo(string s)
{
id = s;
}
main.cpp
main.cpp
#include <string>
#include "Foo.h"
using namespace std;
int main()
{
Foo foo("bar");
return 0;
}
推荐答案
Foo.cpp在你的编译行。它应该看起来像这样:
You're probably not including Foo.cpp in your compile line. It should look something like this:
g++ main.cpp Foo.cpp -o testFoo
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