template<typename T> class Polyhedron { private: vector<Point<T>*> vertices; vector<Facet<T>*> facets; public: Polyhedron(const char* path) { ifstream file(path); if (!file.is_open()) { throw runtime_error("Failed to open file."); } string line; int vertexn = 0, facetn = 0, edgen = 0; file >> line; if (line != "OFF") { throw runtime_error("Invalid file format."); } file >> vertexn >> facetn >> edgen; for (int i = 0; i < vertexn; i++) { T x, y, z; file >> x >> y >> z; vertices.push_back(new Point<T>(x, y, z)); } for (int i = 0; i < facetn; i++) { int vertexIndexCount; file >> vertexIndexCount; vector<Point<T>*> facetVertices; for (int j = 0; j < vertexIndexCount; j++) { int vertexIndex; file >> vertexIndex; facetVertices.push_back(vertices[vertexIndex]); } facets.push_back(new Facet<T>(facetVertices)); } file.close(); } vector<Point<T>*> getVertices() const { return vertices; } vector<Facet<T>*> getFacets() const { return facets; } }; 怎么用某文件构造一个该类的对象?
时间: 2024-01-16 07:04:25 浏览: 24
假设你的 OFF 文件格式如下:
```
OFF
8 6 12
1.0 0.0 0.0
0.0 0.0 0.0
0.0 1.0 0.0
1.0 1.0 0.0
1.0 0.0 1.0
0.0 0.0 1.0
0.0 1.0 1.0
1.0 1.0 1.0
3 0 1 2
3 0 2 3
3 0 3 4
3 0 4 5
3 1 6 2
3 2 6 7
```
可以通过以下方式来使用文件构造一个对象:
```cpp
Polyhedron<double> polyhedron("file.off");
vector<Point<double>*> vertices = polyhedron.getVertices();
vector<Facet<double>*> facets = polyhedron.getFacets();
// ...
```
其中 `Polyhedron` 类的构造函数会读取文件并解析出顶点和面,并将它们存储在类的私有成员变量中。可以使用 `getVertices` 和 `getFacets` 方法来获取解析出的顶点和面。需要注意的是,`Polyhedron` 类是一个模板类,需要在构造对象时指定模板参数类型。这里使用了 `double` 作为模板参数类型。
在使用完 `Polyhedron` 类的对象后,需要手动释放类中动态分配的内存,以避免内存泄漏。可以通过以下方式来释放顶点和面的内存:
```cpp
for (Point<double>* vertex : vertices) {
delete vertex;
}
for (Facet<double>* facet : facets) {
delete facet;
}
```