hyizsg/in-out-ref-with-cpp

C++实现参数in、out、ref语义

#include <string>
#include <vector>
using namespace std;

#define IN      const&
#define OUT     &
#define REF     &

void test(string IN str, vector<int> REF vec, vector<int> OUT outvec)
{
    // TODO...
}

大小写是为了避免跟std内部的定义冲突。

按c++的宏展开，string IN其实就是string const&，经我在xcode里测试，和const string&是一样的，在监视窗口看到的都是const string&类型。

如果有兴趣，可以在自己的项目里面试试

欢迎留言交流~

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C++ implement in、out、ref

#include <string>
#include <vector>
using namespace std;

#define IN      const&
#define OUT     &
#define REF     &

void test(string IN str, vector<int> REF vec, vector<int> OUT outvec)
{
    // TODO...
}

The case is to avoid conflicts with definitions inside std.

Expanding according to the C ++ macro, string IN is actually string const &. After testing in xcode, it is the same as const string &. I see all types of const string & in the watch window.

If you are interested, you can try it in your own project