constants

问题 Browsing .NET Reference source for some details on ClaimsIdentity class I noticed this: [NonSerialized] const string PreFix = "System.Security.ClaimsIdentity."; [NonSerialized] const string ActorKey = PreFix + "actor"; What might be a possible reason to use NonSerializedAttribute on a const ? 回答1: const values are serializable unless they have the NonSerializedAttribute attached to them. Whoever wrote that code, decided they didn't want to have those values serialized. Read the MSDN docs on

问题 Help, I have this class var jMath = { pi2: Math.PI, foo: function() { return this.pi2; } } I want to make the pi2 constant and i want jMath to inherit from Math object. How do I do that? 回答1: Oh amusing, scratch all that, this is the correct version: function JMath() { this.foo = function() { return this.PI; } } JMath.prototype = Math; var jMath = new JMath(); alert(jMath.foo()); (which matches what the other answer is here) (I originally tried to set the prototype using "JMath.prototype =

问题 I'm writing documentation for package I've published, and I find the more thorough your documentation, the easier people find your package to use (duh). I'm actually having a lot of fun lovingly writing up all the features and details of my code. However, I'm completely flummoxed by how to write Sphinx-compatible documentation for class-level variables. In particular, I've got some enum classes I'd like to document, but for the life of me I can't figure out a way to attach documentation to

问题 I'm trying to use the function with the following declaration: extern int stem(struct stemmer * z, char * b, int k)1 I'm trying to pass a C++ string to it, so I thought I'd use the c_str() function. It returns const char * . When I try to pass it to the stem() function, I get this error: error: invalid conversion from 'const char*' to 'char*' [-fpermissive] . How can I store the result of c_str() such that I can use it with the stem function? Here is the code I'm running: struct stemmer * z =

问题 I'm trying to use the function with the following declaration: extern int stem(struct stemmer * z, char * b, int k)1 I'm trying to pass a C++ string to it, so I thought I'd use the c_str() function. It returns const char * . When I try to pass it to the stem() function, I get this error: error: invalid conversion from 'const char*' to 'char*' [-fpermissive] . How can I store the result of c_str() such that I can use it with the stem function? Here is the code I'm running: struct stemmer * z =

问题 I am confused with the two. I am aware of the C++ references which are inherently constant and once set they cannot be changed to refer to something else. 回答1: const int& means reference to const int . (Similarly, int& means reference to non-const int .) int& const literally means const reference (to non-const int ), which is invalid in C++, because reference itself can't be const-qualified. $8.3.2/1 References [dcl.ref] Cv-qualified references are ill-formed except when the cv-qualifiers are

问题 I am confused with the two. I am aware of the C++ references which are inherently constant and once set they cannot be changed to refer to something else. 回答1: const int& means reference to const int . (Similarly, int& means reference to non-const int .) int& const literally means const reference (to non-const int ), which is invalid in C++, because reference itself can't be const-qualified. $8.3.2/1 References [dcl.ref] Cv-qualified references are ill-formed except when the cv-qualifiers are

问题 EDIT: I have edited the whole question, since this is not only for Unity3D, but at all .sln projects. I have a installation of Visual Studio Code(Not Visual Studio, but this:https://code.visualstudio.com/) on my Macbook at work. VSCode is otherwise working just fine with normal and Unity3D projects. I get Intellisense on all classes, including Unity3D specific ones, like GameObject. So I think my installation and startup sequence is correct. Only problem I have, is that VSCode does not seem

问题 I have what is hopefully a trivial question that someone can explain to me in simpler terms than what I have already come across. While working through A Tour of C++ (Second Edition) I've been trying a few examples. I'm currently trying to modify a pointer to a string literal in a separate function (I thought it would be easy.....). using namespace std; void test(char *ptr) { ptr = "test"; } int main() { char *p = "abc"; test(p); cout << p << "\n"; return 0; } When using g++ to compile, I get

问题 static variables in inner classes: inner class cannot contain static fields. It cannot contain static members, because there would be problem where to assign static member. Inner class is connected with outer class. I understand why it does not contain static member, but inner class can contain static constant. Why? Is it specially treated? Is it on special heap? Still it is static member, but constant, so it is specially treated? It can contain: "final static int x", but not "static int x".