前言
写Qt程序的时候，发现自定义数据数据对象就不能用qDebug直接输出了，每次都要写一大串的字符参数列表来打印log，有没有什么办法可以直接打印对象呢？很简单，写个友元函数就OK了
实现
以结构体类型为例，需要实现<<运算符重载
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
| struct Point
{
float x;
float y;
float z;
int id;
int intensity;
int imageX;
int imageY;
Point() {
this->x = qQNaN();
this->y = qQNaN();
this->z = qQNaN();
this->id = qQNaN();
this->intensity = qQNaN();
this->imageX = qQNaN();
this->imageY = qQNaN();
}
Point(const Point &point) {
this->x = point.x;
this->y = point.y;
this->z = point.z;
this->id = point.id;
this->intensity = point.intensity;
this->imageX = point.imageX;
this->imageY = point.imageY;
}
Point &operator =(const Point &point) {
this->x = point.x;
this->y = point.y;
this->z = point.z;
this->id = point.id;
this->intensity = point.intensity;
this->imageX = point.imageX;
this->imageY = point.imageY;
return *this;
}
friend QDebug operator<<(QDebug dbg, const Point &point)
{
dbg << point.id << " : (" << point.x << "," << point.y << "," << point.z << ")" << " intensity : " << point.intensity;
return dbg;
}
};
|
然后自定义的数据可以直接用qDebug打印了
