C# :: How Can A Method Work With Just A Declaration

Feb 28, 2015

I want to access the body of the Add() of a list in c# to see how it works, but it only just gives me the declaration.

[DebuggerTypeProxy(typeof (Mscorlib_CollectionDebugView<>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
public class List<T> : IList<T>, ICollection<T>, IList, ICollection, IReadOnlyList<T>, IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable {
public void Add(T item); // thats all. I tried go to declaration but still gives me this line of code. This is from metadata in Visual studio.
}

How this thing work. It just a declaration not a definition yet its still doing something. How is that possible.

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C++ :: New Data Type In Method Declaration?

May 26, 2013

I want my method of the class to take as an input an array of data type derived from class. How can I do this?

Code:
class Planet {
public:
// typedef class Planet PlanetType;
void GetForce(int, PlanetType []);
};

Or when should I define my new data type PlanetType?

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C++ :: Undefined Reference To (method Name) When Accessing Method In Static Library

Jan 17, 2013

I've been trying for more than one month to access a method found in a library called libcocosnas_static.a. I'm using Cocos2d-X version 2.0.4. The library has been used many times by my company to make games using cocos2d-1.0.1-x-0.12.0 without any problem.

This is what I've done:
1- I added the include paths of the library to both eclipse and Android.mk
2- Included the .h file using #include "NASPlatformUtil.h"
3- Added the libcocosnas_static.a file to the proj.androidobjlocalarmeabi folder
4- Added "LOCAL_WHOLE_STATIC_LIBRARIES += cocosnas_static" to the Android.mk file
5- Called the function using: NASPlatformUtil:: openUrl("http://xxx.xxx.com/");

I can right click on the function, click Open Declaration and get it without any problem, but the compiler keeps on giving me that dreaded error...

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C++ :: Pass Method Of Derived Class As Parameter To Another Method In Base Class?

Feb 2, 2015

I have a question similar to the one here: [URL] .....

The main difference is I would like to pass a method of derived class as a parameter to some other method in its template base class.

template <typename BaseType>
class Base {
public:
typedef void (Base::*Callback)(int A);

[Code] .....

The above is an example which does not compile. My compiler complains that the two BaseMethod() calls in DerivedMethod() are invalid uses of non-static member function.

Is this not possible to do, or is my syntax simply wrong? All I want is to be able to pass as an an argument to a method in the base class from the derived class some callback as a variable for the base class to invoke later.

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C++ :: Using Same Declaration Value More Than Once

Oct 11, 2014

I am trying to make a menu program and was wondering if there is a way to declare something more than once without using a different word.

ex.

#include <iostream>
using namespace std;
double grams, ounces, inches, feet, meters; //units to convert
int choice; //menu choice
int main() {
cout << "Welcome to Measurement Converter" << endl;

[Code] .....

I dont really know how to explain it but im trying to use int choice to make choose a program from a simple list.

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C++ :: Different Array Declaration

Jan 7, 2013

I would like to know the difference between the following two forms of array declaration:

(1)double myArray[3] = {1.0, 2.0, 3.0};

(2)array<double,3> myArray = {1.0, 2.0, 3.0};

If I say the second one allows to use different functions like .begin(), am I right? Is there any other difference between these two declaration?

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C++ :: Using Declaration Within Name Space Scope

Mar 16, 2013

Can we use using declaration within name space scope? is it safe to use it?

I think we can use using declaration for class scope and function scope only.

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C :: Assigning Value During Pointer Declaration

Aug 31, 2013

I am trying to understand the behavior of following code. Basically how does printf() prints the value rather than address.

Does initializing value to a pointer during declaration makes a difference when assigned from a variable?

Code:

1 #include <stdio.h>
2
3 int main() {
4 const char *var1 = 'A';
5 int *vint = 10;

[Code] ....

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C :: Declaration And Definition Of A Variable

May 11, 2013

I read that Memory is allocated during definition of a variable and not during declaration. Declaration is something like,

Code: int x;

And definition is assigning some value to it. This is what my professor taught. My doubt is if memory is not allocated during declaration, then how the compiler successfully compiles and runs the following, which i had already tried.

Code:
#include<stdio.h>
#include<conio.h>
int main() {
int c;
int *p=&c;
printf("%x",p);
getch();
return 0;
}

The variable c is only declared. But the program outputs a memory address. Shouldn't it show an error?

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C++ :: Cstddef Declaration Errors

Feb 17, 2013

I've included <cstddef> into a project of mine in favour of <stddef.h>. When I tried to compile my project, I get 50+ errors stating that types such as "::size_t", "::div_t" and "::abort( )" have not been declared even though <cstddef> includes <stddef.h>.

I've tried searching both the global namespace and the standard namespace, but neither way works. At this moment in time, I don't have any compiler options enabled that may affect the way identifiers are defined, C++11 isn't enabled (which doesn't affect the <cstddef> header anyway), the project is a C++ project, and I've tried using the plain old <stddef.h> header, but the problems still persist.

I'm using GNU's C++ compiler ("__GNUG__" is defined).

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C++ :: Constant Declaration In Function

Jan 20, 2013

What is the difference between:

const int testFunction() &
int testFunction() const

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C++ :: Does Order Of Declaration Matter

Jul 25, 2013

I have recently found this article: URL.....In their example, by declaring variables in other order, they saved 8 bytes. However, shouldn't compiler take care of it? Is it true, and should I declare variables more carefully?

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C++ :: Static Variable Declaration

Oct 4, 2014

If i declare 2 variables like this static int first, second; will both of them be declared static or will only first be declared static and second a regular variable?

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C++ :: Bitset Declaration In Class

Jan 24, 2014

I've got some problems with the declaration of a bitset container in my class

I've got a class A and want to have a bitset container in it, whose size just get's defined when running an instance of this class:

#include <bitset>
class A {
bitset <n> bc;
A(int n) : n(n) {};
};

Something like that.

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C++ :: Array Declaration And Input

Jan 24, 2014

I want to understand the ways in which arrays can be declared and used. What each of the following do or what's the difference between them and what would be the length of each:-

1 - char ary1[50];

2 - char ary2[50] = {'H','e','l','l','o'};

3 - char ary3[50] = {'H','e','l','l','o',''};

4 - char ary4[50] = {''};

5 - char ary5[50] = {'','H','e','l','l','o'};

6 - char ary6[50] = {'','H','e','l','l','o',''};

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C++ :: Class And Variable Declaration?

Aug 2, 2014

#include<iostream>
#include<conio.h>
#include<string>
using namespace std;
class ir;
class Bank_acc {
private:
string name,type,s;
long int accno,temp,balance,in;

[Code]....

errors are:

|6|error: forward declaration of 'class ir'|
|54|error: invalid use of incomplete type 'class ir'|
|99|error: no matching function for call to 'ir::interest()'|

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C++ :: Initializing Struct On Declaration

Dec 20, 2013

Code:

struct foo {
char label[64];
int state;
} bar[3] = { };

Will the above code ALWAYS initialize to 0 all objects:

bar[0].label
bar[0].state
bar[1].label
bar[1].state
bar[2].label
bar[2].state

Using gcc and g++, it does in my testing But was wondering if it can be unsafe under some circumstances.

I even tried without = { } and it is still initialized to 0 for all objects!

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C++ :: Class Forward Declaration Ignored?

Nov 14, 2013

I have a class "SelectionGroup" which derives from a class "RMFObjectContainer". RMFObjectContainer has member variables of type SelectionGroup, so I need to include SelectionGroup.h in the header of RMFObjectContainer.h.

However, since SelectionGroup needs RMFObjectContainer to derive from it, I get a typical case of mutual inclusion.

I then proceeded to put the forward declaration
class RMFObjectContainer;
instead of
#include "RMFObjectContainer.h"
into the header of SelectionGroup.h.

However, I receive the following compile error (MSVC2010), as if the forward declaration was unseen:

#pragma once
#include "Solid.h"
#include "Entity.h"
#include "SelectionGroup.h"

[Code]....

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C/C++ :: Structures Declaration And Definition

Dec 17, 2013

is possible to combine structures declaration and definition in programming language?

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C++ :: Forward Declaration Location

Jun 6, 2012

Any difference between

Code:
class SomeOtherClass;
void foo(SomeOtherClass* p);

And

Code:
void foo(class SomeOtherClass* p);

I was told that "2" would limit the scope of the forward declaration to the declaration of foo... However, after testing it, it appears that both behave the same...

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C++ :: Declaration Syntax Error

Apr 20, 2012

I keep getting a "Declaration syntax error" at line ""int main()". Is there something wrong with my int main()? And how do I go about it? Here is the program:

#include<stdlib.h>
#include<iostream.h>
#include<stdio.h>
#include<math.h>
#include<conio.h>
float rung4(float x, float y, float h)
int main() {
float eps=0.00001;

[Code] .....

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C++ :: How To Initialize Structures After Declaration

Aug 4, 2012

I would like to write a program that prompts the user to enter a series of client names which the program will then store in an array of structures. I'm thinking something along the lines of:

struct sInfo {
vector<string> vName;
float fClientHoldings;
};
sInfo sClientData[100]; //create an array of structures for up to 100 client's
sClientData[0].vName="Acme"; //these will be inputted by the user in my program, but I've attempted to initialize them here for simplification
sClientData[1].vName="Enron";

I can't declare a structure array after I declare it. Is this true? If so, is there an alternate approach that I should be using?

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C++ :: Segfault At Declaration Of 2D Array

Jan 19, 2014

I have a little program that does some statistical processing on text files. The program has thrown a segmentation fault with an input file that is larger that I have used before. I didn't write this tool, so I went searching for the problem. Data from the input file is dumped into a 2D array and the program fails at the declaration of that array.

Code : double A[cont][Nr_col_split];

The vales for cont and Nr_col_split and determined from the input file and in this case, cont=807 and Nr_col_split=350. I assume that these values are just too large and not enough memory can be allocated, or something like that. Do I need to use reserve or similar to set aside enough memory? I will have input files that are quite a bit bigger than this one, so perhaps there needs to be a different solution for storing the input file data.

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C :: Declaration Of Array In Another Source File

May 5, 2014

I was going through a code where i found the definition of int array[63] in one of the source files. But i also found the declaration as extern int array[66] in another source file. This is clearly wrong, but my doubt is how the compiler compiled it. It should have thrown error. In case if it compiles then what will be the behavior of the system? Will it be normal or some undefined behavior?

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C :: Declaration And Definition Of External Variable

Jan 11, 2014

Why I take warning on this code :

Code:
#include<stdio.h>
extern int v = 0; // Declaration and definition of an external
int main(void)

[code]...

Is there any error? Why I take a warning: 'v' initialized and declared 'extern'|||=== Build finished: 0 errors, 1 warnings ===| ???

and what is the meaning of :An extern declaration that initializes a variable serves as a definition of the variable. This rule prevents multiple extern declarations from initializing a variable in different ways.

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C :: Automatic Declaration Of Array Variables

Jul 14, 2014

I have some files:

file1: 1000x500 array of numbers
file2: 2000x600
file3: 300x5000
...

I would like to automatically declare array variables of myarray1, myarray2, myarray3... that reads the numbers from files:

Code:
for (i1=0; i1<nrows; i1++)
{
for (i2=0; i2<ncolumns; i2++)
{
fscanf(filename, "%lf", &y);
myarrayX[i1][i2]=y;
}
}

nrows and ncolumns can be passed from a config file. Also I can cat all files into a single filename. However, the difficult part is:

How to declare different myarrayX automatically ? (A workaround is to declare a huge 3d array but I do not want to do this).

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