[英]c++ List of classes without initializing them for use of static functions
I may be asking this in a odd way, but I'm not sure how else to ask. 我可能以一种奇怪的方式问这个问题,但是我不确定还有什么要问的。
I want to have a list of classes, not objects. 我想要一个类列表,而不是对象。 This way I can call static functions without have to create the object.
这样,我无需创建对象就可以调用静态函数。
I would really prefer function pointers at this point: 在这一点上,我真的更喜欢函数指针:
struct A
{
void SomeFunc(int);
};
struct B
{
void AnotherFunc(int);
};
typedef void (*Function)(int);
std::vector<Function> vec;
vec.push_back(A::SomeFunc); vec.push_back(B::AnotherFunc);
for (Function f: vec)
{
f(2);
}
Note that a static function is more or less equivalent to a traditional C-function (it just got to access some more scope). 请注意,静态函数或多或少等效于传统的C函数(它只是需要访问更多作用域)。
What you are looking for are boost typelists . 您正在寻找的是boost类型列表 。 I would however not recommend diving into the Boost MPL if you are not already very experienced with templates, and know how many of their intricacies work.
我不过不推荐潜入了Boost MPL如果你是不是已经非常有经验的模板,并知道有多少他们的复杂工作。
Now for a simple home-made implementation: 现在进行简单的自制实现:
struct Null {};
template <typename Type, typename Next>
struct List
{
typedef Type Type;
typedef Next Next;
};
//Now you can make lists like so:
typedef List<int, List<float List<short, Null> > > MyList;
From there use recursive Templated implementations to call the static methods you want. 从那里使用递归模板化实现来调用所需的静态方法。
If you want more information on these kinds of techniques, you should read Modern C++ Design 如果您想了解有关这些技术的更多信息,请阅读Modern C ++ Design
作为解决方案,您可以创建方法指针列表
http://www.boost.org/doc/libs/1_45_0/libs/mpl/doc/refmanual/refmanual_toc.html http://www.boost.org/doc/libs/1_45_0/libs/mpl/doc/refmanual/refmanual_toc.html
eg: 例如:
typedef vector<C1,C2,C3> types;
at_c<types,0>::type::method();
...
I don't think what you are asking is possible, at least not in the way you think. 我认为您的要求是不可能的,至少不会以您的想法。 You cannot have a variable, array, container class or any other storage of type names.
您不能具有变量,数组,容器类或类型名称的任何其他存储。 So you cannot do something like
所以你不能做这样的事情
ListOfClasses[n]::someStaticMember(...);
in C++. 在C ++中。 It is impossible.
是不可能的。
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