[英]How to access a variable defined in a struct
struct POINT3DID
{
unsigned int newID;
float x, y, z;
};
typedef std::map<unsigned int, POINT3DID> ID2POINT3DID;
ID2POINT3DID m_i2pt3idVertices;
Can someone please tell me how can I access the variables x,y and z
using m_i2pt3idVertices
有人可以告诉我如何使用
m_i2pt3idVertices
访问变量x,y and z
m_i2pt3idVertices
is a container for storing POINT3DID
objects. m_i2pt3idVertices
是用于存储POINT3DID
对象的容器。 Alone, it doesn't have member variables x
, y
, or z
. 单独没有成员变量
x
, y
或z
。 You can put a POINT3DID
inside of it though: 您可以将
POINT3DID
放入其中:
m_i2pt3idVertices[0] = POINT3DID(); // Put a POINT3DID into key 0
m_i2pt3idVertices[0].x = 1.0f; // Assign x for key 0
m_i2pt3idVertices[0].y = 2.0f; // Assign y for key 0
m_i2pt3idVertices[0].z = 3.0f; // Assign z for key 0
You need to use iterator. 您需要使用迭代器。 Here is a sample:
这是一个示例:
std::map<unsigned int, POINT3DID>::iterator it;
it = m_i2pt2idVertices.find(5);
it->second.x = 0;
it->second.y = 1;
it->second.z = 2;
ID2POINT3DID
is map container. ID2POINT3DID
是地图容器。 You can access single element by some unsigned int
key: 您可以通过一些
unsigned int
键访问单个元素:
m_i2pt3idVertices[42].x
Or you can iterate over elements in container: 或者,您可以遍历容器中的元素:
for(ID2POINT3DID::iterator it=m_i2pt3idVertices.begin();it!=m_i2pt3idVertices.end();++it) {
cout << it->second.x << " " << it->second.y << " " << it->second.z << endl;
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.