static-functions | 易学教程

How to obtain static member variables in MATLAB classes?

阅读更多关于 How to obtain static member variables in MATLAB classes?

Is there a way to define static member variables in MATLAB classes? This doesn't work: classdef A properties ( Static ) m = 0; end end It suggests to use keyword "Constant" instead of "Static", the constant properties cannot be modified. I want a variable common to all objects of class A and I want to be able to modify that variable in methods of class A . So what I need is a private static member variable. Is there a way to obtain it in MATLAB? Found out that a workaround can be done using persistent variables in static member functions. In this case you should inherit all your classes from a

Static member functions error; How to properly write the signature?

阅读更多关于 Static member functions error; How to properly write the signature?

问题 I am getting an error when trying to compile my code in g++ using the current signature: cannot declare member function static void Foo::Bar(std::ostream&, const Foo::Node*) to have static linkage My question is twofold: Why does it not Compile this way? What is the correct signature, and why? Signatures have always been the death of me when using C++ Edit: Here is the class header file, as well: class Foo { public: Foo(); ~Foo(); bool insert(const Foo2 &v); Foo * find(const Foo2 &v); const

C API function callbacks into C++ member function code

阅读更多关于 C API function callbacks into C++ member function code

问题 So, I'm using the FMOD api and it really is a C api. Not that that's bad or anything. Its just it doesn't interface well with C++ code. For example, using FMOD_Channel_SetCallback( channel, callbackFunc ) ; It wants a C-style function for callbackFunc , but I want to pass it a member function of a class. I ended up using the Win32 trick for this, making the member function static. It then works as a callback into FMOD. Now I have to hack apart my code to make some of the members static, just

How to obtain static member variables in MATLAB classes?

阅读更多关于 How to obtain static member variables in MATLAB classes?

问题 Is there a way to define static member variables in MATLAB classes? This doesn't work: classdef A properties ( Static ) m = 0; end end It suggests to use keyword "Constant" instead of "Static", the constant properties cannot be modified. I want a variable common to all objects of class A and I want to be able to modify that variable in methods of class A . So what I need is a private static member variable. Is there a way to obtain it in MATLAB? Found out that a workaround can be done using

Superiority of unnamed namespace over static?

阅读更多关于 Superiority of unnamed namespace over static?

问题 How are unnamed namespaces superior to the static keyword? 回答1: You're basically referring to the section $7.3.1.1/2 from the C++ Standard, The use of the static keyword is deprecated when declaring objects in a namespace scope; the unnamed-namespace provides a superior alternative. Unnamed namespace is superior to static keyword, primarily because the keyword static applies only to the variables declarations and functions, not to the user-defined types . The following code is valid in C++ /