I'm pretty new to programming and am generally confused by header files and includes. I would like help with an immediate compile problem and would appreciate general suggestions about cleaner, safer, slicker ways to write my code. I'm currently repackaging a lot of code that used to be in main() into a Simulation class. I'm getting a c...
I have a class template<size_t N, size_t M> class Matrix { // .... }; I want to make a typedef which creates a Vector (column vector) which is equivalent to a Matrix with sizes N and 1. Something like that: typedef Matrix<N,1> Vector<N>; Which produces compile error. The following creates something similar, but not exactly what...
It is my understanding that typedef enums are globally scoped, but if I created an enum outside of the @interface of RandomViewController.h, I can't figure out how to access it from OtherViewController.m. Is there a way to do this? So... "RandomViewController.h" #import <UIKit/UIKit.h> typedef enum { EnumOne, EnumTwo }EnumType; @i...
I have a class like this template< typename T > class vector { public: typedef T & reference; typedef T const & const_reference; typedef size_t size_type; const_reference at( size_t ) const; reference at( size_t ); and later in the same file template< typename T > typename vector<T>::const_reference ...
I am doing this assignment, and there are some stuff (from start-up materials) that I cannot comprehend. typedef enum { NORTH, EAST, SOUTH, WEST, NUM_POINTS } Point; typedef Point Course[NUM_POINTS] ; I don't get the idea behind the last line , and how can I use it in the code? ...
The Size of pointer depends on the arch of the machine. So sizeof(int*)=sizeof(int) or sizeof(int*)=sizeof(long int) I want to have a custom data type which is either int or long int depending on the size of pointer. I tried to use macro #if, but the condition for macros does not allow sizeof operator. Also when using if-else, typed...
I read the other posted solutions to using structs and resolving the "Expected specifier-qualifier-list before struct" related errors, but those aren't working. Is it different in Objective C? Do I need to declare my struct somewhere else in the class? It gives me the error on the line where I declare the typedef. Here is how it look...
Here is what I'm trying: typedef cli::array<int> intarray; int main(){ intarray ^ints = gcnew intarray { 0, 1, 2, 3 }; intarray::Reverse(ints); // C2825, C2039, C3149 return 0; } Compilation resulted in the following errors: .\ints.cpp(46) : error C2825: 'intarray': must be a class or namespace when followed by '::' ...
Possible Duplicate: What does unsigned temp:3 means I just found this code in a book (was used in an example) typedef struct { unsigned int A:1; unsigned int B:1; unsigned int C:1; } Stage; What is the meaning of this structure definition? (the A:1;) ...
Is the following allowed? typedef Foo<Bar> Bar; My compiler complains that 'class Bar' has a previous declaration as 'class Bar'. ...
Hi, i need to do a typedef like this. template< class A, class B, class C > class X { }; template< class B, class C > typedef X< std::vector<B>, B, C > Y; I just found that it is not supported in C++. Can someone advise me on how to achieve the same through alternative means? Thanks, Gokul. ...
If I have something like: typedef int MyType; is it good practice to cast the operands of an operation if I do something like this: int x = 5; int y = 6; MyType a = (MyType)(x + y); I know that I don't need to do that but wondering if it's better for intent/documentation/readability concerns. Or, should I just do: MyType a = x + ...
As in stl containers, why can't we access a typedef inside the class from the class instance? Is there a particular insight into this? When value_type was a template parameter it could help making more general code if there wasn't the need to specify the template parameters as in vector::value_type Example: class T { public: typ...
Hello, I'm creating event system. It's based under boost::signals. To make the work easier I'm using typedef for the function signatures. Everything is okey until I need creating of some new event trought event's system method. I have to create the typedef dynamically on given type to the template function. The problem is the name of ty...
Recently I am having many problem with typedef and incomplete type when I changed certain containers, allocators in my code. What I had previously struct foo;//incomplete type. typedef std::vector<foo> all_foos; typedef all_foos::reference foo_ref; Though not completely not sure whether the above lines are legal, but this worked on e...
Hi, the following code is an example of something I'm trying to do in a large project: #include <iostream> #include <vector> // standard template typedef workaround template<typename T> struct myvar {typedef std::vector<T> Type;}; template<typename T> T max(typename myvar<T>::Type& x) // T max(std::vector<T>& x) { T y; y=*x.begin(...
If you define a type like typedef int MY_INT; and go on to overload, say, the adition operator of MY_INT like MY_INT operator+(MY_INT a, MY_INT b); will MY_INT a, b; a + b; be different from int A, B; A + B; ? Sorry for any syntax errors. I'm not near a compiler and I want to ask this before I forget about it. ...
Hi all, I'm having a problem when trying to compile these two classes (Army and General) in their own header files: #ifndef ARMY_H #define ARMY_H #include "definitions.h" #include "UnitBase.h" #include "UnitList.h" #include "General.h" class Army { public: Army(UnitList& list); ~Army(void); UnitBase& operator[](con...
I'm having trouble with inserting some value_pairs into a map. Here's the basic idea. // private typedef Foo* (*Bar)( const std::string &x, int y ); typedef std::map<std::string, Bar> myMap; template<class T> Foo* DoThing( const std::string &x, int y ) { return new T( x, y ); } myMap m_map; // some map insertion code m_map.insert( ...