C++ :: Global Scope And Scope Resolution Operator
Jun 14, 2013
Are there any situations to explicitly use the scope resolution operator with global scope? I can imagine a situation like:
#include <cmath>
class IntWrapper{
public:
IntWrapper& pow(char);
IntWrapper(char);
private:
int m_int;
[Code] ....
But then I would think that the writer should have used a different name, and that using the scope resolution operator in the constructor body is still pointless...
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Feb 21, 2013
I have done alot of googling for the scope resolution operator and Ive gained a bit of an understanding as to what it does i know it can distinguish between global and local variables, but I see it used to access methods/members of classes such as this example, why not just use a dot instead to access it?:
sql:: Driver *driver;
Why is the scope resolution operator being used here?
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Jan 30, 2013
The compiler "forces" me to use the std::max method, I cannot override it even when writing ::max in my code.
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Jun 15, 2014
//I dont understand this why does "<< "
The value of global now is: " << global << "
";" is equals to nine
#include <iostream>
int subtract (int a, int b);
int global = 5;
int main(void) {
using std::cout;
int a, b;
[Code] ....
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Aug 8, 2013
Code:
#include <iostream>
using namespace std;
void f() {
int x=17;
//cout<<main::y<<endl; i want to access y from main scope
}
int main() {
int y=23;
//cout<<f::x<<endl;
I want to access x from f scope is there any way for this without global declaration? specially about function scopes...
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Nov 17, 2013
is there any variable type(or with another keyword) that we can change it's value in global scope?
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Apr 22, 2013
Did a little Googling on this but couldn't find anything definitive. Is it safe to do something like
Code:
void MyClass::myFunc(){
my_type_t &foo = some_obj->get_member_reference();
store_for_later(&foo);
}
Then at some pointer later in execution, another function uses the pointer passed to store_for_later.
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Dec 14, 2013
The situation is the following :
Code:
vector<int>& function(int a , int b){
vector<int> s(3000000);
vector<int> xxx(4);
return xxx
}
Not to board people with details but if i am returning the the reference to a vector xxx what happens to vector s. is it destroyed ?? it should be, but i don't see it on my memory map (memory is not released) . can this be or should i go and search for error on some other place.....
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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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Oct 9, 2013
how to solve this undeclared error when compiling this code. I assume it has something to do with scope.
C code - 47 lines - codepad
Code:
#include <stdio.h>
int main(void) {
struct bank_account {
[Code].....
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Oct 29, 2014
main.cpp
#include <iostream>
#include "sushi.h"
using namespace std;
int main()
{
do {
......sushi go;
......string x; <----------------------------Declared x here
......cout << "wanna use a banana?" << endl;
[Code ....
Error reads: 'x' was not declared in this scope.
How do I fix this?
P.S The sushi class does not matter, that is all perfect. Also, the dots are to represent my tabbing to make it easier to understand.
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Jan 10, 2015
For some reason my compiler says "rename not declared in this scope" .... Isn't it declared in iostream? Or is rename only for C not C++? And if it is only for C how do I rename a file in C++ then?
#include <iostream>
#include <cstdlib>
using namespace std;
int main(int argc, char* argv[]){
char oldname[] = "RomeTW.exe";
[Code] .....
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Jul 2, 2012
I have c# code something like below.
void ExecuteSomething() {
TransactionOptions transactionOptions = new TransactionOptions();
transactionOptions.IsolationLevel = System.Transactions.IsolationLevel.ReadUncommitted;
transactionOptions.Timeout = TimeSpan.FromSeconds(TransactionTimeOutInSeconds);
[Code] ....
I am retrieving the data by using above code
From some other code i am calling some function in c# through windows service. That function is going to delete some unwanted data from sql server database. if i wanted i initiate the request it will take 30 min to delete the data.
in this 30 min time i am unable to access other pages in my website. is there any better way to design this?
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Jan 31, 2014
Ran into something today that does not make sense:
This compiles: Code: int x = 5;
switch(x) {
case 0:
{
int value = 5;
}
break;
[Code] ....
Ok so it doesn't like int value = 6 b/c of int value = 5 for case 0. However since the value in case 0 is declared within the brackets one would think it has case scope.
So I tried this:
Code: int x = 5;
switch(x) {
case 0:
{
int value = 5;
}
break;
[Code] ....
Now it doesn't like it b/c value has not been declared in case 1:. These two conditions cannot possibly be both true at the same time. You cannot disallow the declaration of value in case 1 b/c it interferes with value in case 0 and at the same time disallow me to use value from case 0 b/c it is not in scope. If it was not in scope then theoretically I should be able to declare value in case 1.
Both MSVS 2012 and 2013 exhibit the same behavior. I checked the standard and it is unclear on the matter.
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Dec 16, 2013
Is it's scope confined to that single case?
char ch;
switch(ch) {
case '1':
using namespace common::section1; //only this case??
break;
[Code] ....
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Oct 11, 2014
I'm trying out friend functions not in just one source file to see how it works but I'm getting an error.
/* ----- ClassOne.h ----- */
#ifndef CLASSONE_H_
#define CLASSONE_H_
#include "classTwo.h"
using namespace std;
class ClassOne {
[Code] ....
Basically, I just want to print out the private members of ClassOne using ClassTwo's friend function twoPrintsOne().
The error is in classTwo.cpp and it says that m_a and m_b in the twoPrintsOne function are not declared in this scope.
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Dec 11, 2013
I have observed that inline functions can not be prototyped. example:
.cpp file:
inline void whatever() {
cout<< "this is inline"<< endl;
}
.h file, prototype
inline void whatever(); //would ask for a definition
Because of this, I have have just made functions that are used in only 1 .cpp file (ever) inlined, to make it more efficient (and it has demonstrated that it is more efficient). It's worked out fine so far, but what about the scope of the definition??
Since an inline function is like a templated function, in that it can't be prototyped, how are name conflicts resolved, and what is the best practice for writing inline functions??
Example of a conflict:
//in some arbitrary header...
void do_somthing();
//in .cpp file that inlcudes the header...
inline void do_somthing() {
cout<< "I'm doing somthing!!"<< endl;
} int main() {
do_somthing(); //which one?? it compiles fine though!!
return 0;
}
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May 20, 2013
I have this error - [Error] 'fprintf' was not declared in this scope (line 32)
and this - [Error] 'fclose' was not declared in this scope (line 33)
here's my code.........
1 #include <iostream>
2 using namespace std;
3 #include <windows.h>
4 #include <winuser.h>
5
6 int save (int key_stroke, char *file);
[Code] ......
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Jan 27, 2014
I'm working through this neural network tutorial, unfortunately I get stuck trying to compile on line 28, saying "error: 'neuronNum' not declared in this scope." I seem to always get stuck on these kinds of errors, yet I don't understand because I though that the variable was declared and initialized within the for loop.
#include <iostream>
#include <vector>
using namespace std;
[Code]....
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Jan 28, 2014
I'm trying to make a dynamic 2d array of a Tile Object I created, the Dynamic 2d array was working when I tested it as an int array but not that I gave it a type of Tile it is giving me the above error. I'm reading values from a .txt .
tile Tile;
Tile **grid;
grid = new Tile*[a];
for (int i = 0; i < a; ++i) {
grid[i] = new Tile[b];
}
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Mar 31, 2015
Code:
#include <iostream>
#include <vector>
#include <cmath>
#include "ANN.h"
using namespace std;
const int NUM_HIDDEN_NEURONS = 3;
[Code] ....
So I am getting 2 errors. Here is both of them.
ANN.cpp: In member function "void ANN::JustDoIt()":
ANN.cpp:36: error: "class std::vector<HiddenNeuron, std::allocator<HiddenNeuron> >" has no member named "SetWeights"
ANN.cpp: In member function "void ANN::SetData(double, double)":
ANN.cpp:85: error: "SetNeuronData" was not declared in this scope
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Mar 21, 2012
Code:
class CObjects {
int m_CurrentTime;
int m_Steps;
AStarList* OPEN;
AStarList* CLOSED;
std::vector<AStarNode *>solution;
[code]....
CCB is derived from CrowdEntity and in turn is derived from CObjects Inside CObjects, I declared AStarList *OPEN; Why would howmany become garbage (cdcdcdcd) when I reference it in GetBestNode()
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May 1, 2014
trying to use a void function below. How do I correct scope not declared for numYears and numChildren?
4#include <iostream>
5#include <cmath>
6using namespace std;
7
8// Function prototype
[code]....
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Apr 13, 2014
I have the following code here. My questions are:
1. Pointers can be used as pass by reference. When I dynamically allocated memory for array[50] in the run function, does that mean I am changing the size of the pArray in main as well? Or does the scope of array[50] ends with the function run? if so, should I do a delete [] Array inside the run function?
2. When I do delete[] pArray in main, what does it delete? memory for array[50]? or array[100]?
#include <iostream>
using namespace std;
void run(int* Array, int& s) {
s = 50;
Array = new int[s];
[Code] ....
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Dec 5, 2014
I am trying to make an interpreter. This stack function is supposed to represent the scope of the program, meaning scope of the variables. The START represents a new scope, and FINISH represents the current scope closing. I am trying to do a recursive function in which the stack is updated with each recursive call, which represent a new scope for each call.After i enter a new scope and the scope ends, my program prematurely terminates.
void stack(ifstream& file,Hash& Table) {
string line;
getline(file,line);
int i=0;
[code].....
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May 13, 2014
I've got this sorting program that uses variables from another class but I'm not sure why its not recognizing it. I'm getting an error length and list not declared in this scope.
#include <iostream>
#include "arrayListType.h"
using namespace std;
template<class elemType>
class orderedArrayListType: public arrayListType<elemType> {
[Code] ....
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