In my iOS5 app, I have NSObject States class, and trying to init it: states = [states init]; here is init method in States: – (id) init { if ((self = [super init])) { pickedGlasses = 0; } return self; } But there is error in the line states = [states init]; receiver type “States” … Read more
I recently got stuck in a situation like this: class A { public: typedef struct/class {…} B; … C::D *someField; } class C { public: typedef struct/class {…} D; … A::B *someField; } Usually you can declare a class name: class A; But you can’t forward declare a nested type, the following causes compilation error. … Read more
Is it possible to forward-declare a function in Python? I want to sort a list using my own cmp function before it is declared. print “\n”.join([str(bla) for bla in sorted(mylist, cmp = cmp_configs)]) I’ve organized my code to put the definition of cmp_configs method after the invocation. It fails with this error: NameError: name ‘cmp_configs’ … Read more
At: http://www.learncpp.com/cpp-tutorial/19-header-files/ The following is mentioned: add.cpp: int add(int x, int y) { return x + y; } main.cpp: #include <iostream> int add(int x, int y); // forward declaration using function prototype int main() { using namespace std; cout << “The sum of 3 and 4 is ” << add(3, 4) << endl; return 0; … Read more
Why won’t the compiler let me forward declare a typedef? Assuming it’s impossible, what’s the best practice for keeping my inclusion tree small? 10 Answers 10
I am looking for the definition of when I am allowed to do forward declaration of a class in another class’s header file: Am I allowed to do it for a base class, for a class held as a member, for a class passed to member function by reference, etc. ? 13 s 13 Put … Read more
