有人可以解释一下我在这里做错了什么吗？我正在使用 macOS以下是代码：
//test.h
#include <iostream>
#include <string>
class Test
{
public:
Test (std::string, std::string, int);
private:
std::string par1;
std::string par2;
int par3;
};
测试.cpp
#include <string>
#include <string>
#include "test.h"
using namespace std;
Test::Test (string first, string second, int third)
{
par1 = first;
par2 = second;
par3 = third;
}
/mainTest.cpp
#include <string>
#include <iostream>
#include "test.h"
using namespace std;
int main()
{
Test test1 ("A", "B", 2);
}
我用来编译的命令是：
g++ mainTest.cpp -o mainTest
这是我得到的错误：
Undefined symbols for architecture x86_64:
"Test::Test(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, int)", referenced from:
_main in mainTest-056a8f.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我已经搜索了stackoverflow和谷歌，但我仍然无法弄清楚我做错了什么。多谢
您没有链接到test.o。
g++ -c test.cpp -o test.o
g++ mainTest.cpp test.o -o mainTest
或者您可以同时执行这两项操作：
g++ maintest.cpp test.cpp -o mainTest