C++字符串的Copy异常处理

#include <iostream>

using namespace std;

//异常基类
class BaseMyException {
public:
    virtual void what() = 0;
    virtual ~BaseMyException(){}
};

class TargetSpaceNullException :public BaseMyException
{
public:
    virtual void what() {
        cout << "目标没有空间！" << endl;
    }
    ~TargetSpaceNullException() {}

};
class SourceSpaceNullException :public BaseMyException
{
public:
    virtual void what()
    {
        cout << "源文件没有空间！" << endl;
    }
    ~SourceSpaceNullException() {}
};

void copy_str(char* target, char* source)
{
    if (target == NULL)
    {
        throw TargetSpaceNullException();
    }
    if (source == NULL)
    {
        throw SourceSpaceNullException();
    }
    while (*source != '\0')
    {
        *target = *source;
        target++;
        source++;
    }
}
void main()
{
    char* source = "SeraphGabriel";
    char buf[1024] = { 0 };
    try {
        copy_str(buf, source);
    }
    catch (BaseMyException& ex)
    {
        ex.what();
    }
    
    cout << buf << endl;
    return;
}