I am trying to implement marching cubes in C#, but I've come to a part where I don't understand the algorithm and I don't how to implement it. int Polygonise(GRIDCELL grid, double isolevel, TRIANGLE *triangles) The third argument I don't really understand. I know it's a pointer, but later on in the algo, when you set the triangles it appears as though the triangles variab
我正在尝试在C#中实现进行中的多维数据集,但是我已经到了一个我不了解算法的部分,我不知道如何实现它。 int Polygonise(GRIDCELL grid, double isolevel, TRIANGLE *triangles) 我不明白的第三个理由。 我知道这是一个指针,但后来在算法中,当您设置三角形时,它看起来好像triangles变量是TRIANGLE结构体的数组: int ntriang = 0; for (int i=0; triTable[cubeindex,i]!=-1; i+=3) { triangles[ntriang].p[i ] =
This is a follow-up to my previous question on pretty-printing STL containers, for which we managed to develop a very elegant and fully general solution. In this next step, I would like to include pretty-printing for std::tuple<Args...> , using variadic templates (so this is strictly C++11). For std::pair<S,T> , I simply say std::ostream & operator<<(std::ostream & o
这是我之前关于漂亮打印STL容器的问题的一个后续,为此我们开发了一个非常优雅且完全一般的解决方案。 在下一步中,我想使用可变参数模板来包含std::tuple<Args...>漂亮打印(所以这完全是C ++ 11)。 对于std::pair<S,T> ,我只是说 std::ostream & operator<<(std::ostream & o, const std::pair<S,T> & p) { return o << "(" << p.first << ", " << p.seco
In templates, where and why do I have to put typename and template on dependent names? What exactly are dependent names anyway? I have the following code: template <typename T, typename Tail> // Tail will be a UnionNode too. struct UnionNode : public Tail { // ... template<typename U> struct inUnion { // Q: where to add typename/template here? typedef Tail::
在模板中,为什么我必须在相关名称上放置typename和template ? 无论如何,依赖名称究竟是什么? 我有以下代码: template <typename T, typename Tail> // Tail will be a UnionNode too. struct UnionNode : public Tail { // ... template<typename U> struct inUnion { // Q: where to add typename/template here? typedef Tail::inUnion<U> dummy; }; template<
I hope this doesn't come across as a stupid question but it's always something I have wondered. Both Windows (Win32 API) and OS X (Cocoa) have their own APIs to handle windows, events and other OS stuff. I have never really got a clear answer as to what Linux's equivalent is. I have heard some people say GTK+, but GTK+ being cross platform, how can it be native? In Linux the gra
我希望这不会成为一个愚蠢的问题,但它总是我想知道的。 Windows(Win32 API)和OS X(Cocoa)都有自己的API来处理窗口,事件和其他操作系统的东西。 我从来没有真正清楚Linux的等价物的答案。 我听说有人说GTK +,但GTK +是跨平台的,它怎么可能是本地的? 在Linux中,图形用户界面不是操作系统的一部分。 大多数Linux桌面上的图形用户界面由称为X Window System的软件提供,该软件定义了处理屏幕,键盘和指针设备的独立
Possible Duplicate: Officially, what is typename for? Where and why do I have to put the template and typename keywords? consider the code below: template<class K> class C { struct P {}; vector<P> vec; void f(); }; template<class K> void C<K>::f() { typename vector<P>::iterator p = vec.begin(); } Why is the "typename" keyword necess
可能重复: 官方,什么是typename? 我在哪里以及为什么必须放置模板和typename关键字? 考虑下面的代码: template<class K> class C { struct P {}; vector<P> vec; void f(); }; template<class K> void C<K>::f() { typename vector<P>::iterator p = vec.begin(); } 为什么在这个例子中需要“typename”关键字? 是否有其他情况下必须指定“typename”? 简短的回答
For templates I have seen both declarations: template < typename T > template < class T > What's the difference? And what exactly do those keywords mean in the following example (taken from the German Wikipedia article about templates)? template < template < typename, typename > class Container, typename Type > class Example { Container< Type, std::allocat
对于模板,我看到了两个声明: template < typename T > template < class T > 有什么不同? 在下面的例子中,这些关键词究竟意味着什么(摘自德国维基百科有关模板的文章)? template < template < typename, typename > class Container, typename Type > class Example { Container< Type, std::allocator < Type > > baz; }; 在指定模板的基本情况下, typename和class是可
I'm trying to make an inline definition of a template class ctor under the class definition (I know you can do it inside, but I prefer to do it outside in the header file). However, MSVC is telling me that Matrix requires a template argument list in the ctor definition... I can easily solve this by defining the function inside the class (it still will be inlined), but I would prefer to do it
我试图在类定义下创建一个模板类ctor的内联定义(我知道你可以在里面做,但我更喜欢在头文件的外面做)。 然而,MSVC告诉我, Matrix需要ctor定义中的模板参数列表...我可以通过在类中定义函数(它仍然会被内联)轻松解决这个问题,但是我宁愿在外面去做,因为美学原因。 有没有办法解决这个问题? // .hpp #pragma once template <typename T, size_t rows, size_t cols> class Matrix { private: constexpr siz
This question already has an answer here: Where and why do I have to put the “template” and “typename” keywords? 5 answers Use typename here: typename vector<elemType>::const_iterator Because const_iterator is a dependent name (which is also shown in the error message). Search this site to know more about dependent-name. Better use auto and range-based for loop.
这个问题在这里已经有了答案: 我在哪里以及为什么必须放置“模板”和“类型名称”关键字? 5个答案 在这里使用typename : typename vector<elemType>::const_iterator 因为const_iterator是一个从属名称(它也显示在错误信息中)。 搜索本网站以了解更多关于依赖名称的信息。 更好地使用auto和基于范围的循环。
The following code is in a .h file (with include guards) template<typename T1, typename T2> // a void func(T1 const &t1, T2 const &t2) { std::cout << "nbase template"; } template<> // b inline void func<int, int>(int const &t1, int const &t2) { std::cout << "nspecialization for integers"; } When removing the inline keyword from (b) the fol
以下代码位于.h文件中(包含防护) template<typename T1, typename T2> // a void func(T1 const &t1, T2 const &t2) { std::cout << "nbase template"; } template<> // b inline void func<int, int>(int const &t1, int const &t2) { std::cout << "nspecialization for integers"; } 从(b)中删除内联关键字时,下面的代码(包含.h的.cpp调用)将不会编译 func
This question already has an answer here: Why can templates only be implemented in the header file? 13 answers The C++ compiler needs to see the template definition in order to perform implicit instantiation. This means, the C++ compiler can only generate the object code for the template function call automatically if it knows the implementation at the time you invoke it. You can, however
这个问题在这里已经有了答案: 为什么只能在头文件中实现模板? 13个答案 C ++编译器需要查看模板定义以执行隐式实例化。 这意味着,如果C ++编译器在调用它时知道实现,则它只能自动为模板函数调用生成目标代码。 但是,您可以依赖显式实例化。 这意味着您要求编译器为您指定的模板的特定实例生成C ++代码。 然后,在main.cpp使用模板时,链接时C ++编译器将能够找到该实现(通过外部链接)。 //a.cpp #include "a.h