C++ :: Handling Static Cast Failures

Oct 10, 2014

Is it possible to handle situations where static cast fails. I have a sample code written belo:

typedef struct test {
int a;
int b;
} tester;
void setevent(void *in) {
tester *recv = static_cast<tester*>(in);

[Code] ....

In above code when setevent is called with the tester object, there is no issue, but if we pass random value it leads to seg fault. This is because static_cast is not type_safe, but can it be handled in any other way?

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C++ :: Difference Between Static And Dynamic Cast?

Oct 10, 2013

Is there a difference between having static and dynamic cast in this scenario? The output is the same.

Code:
Base* pb = new Derived();
if(Derived* pd2 = static_cast<Derived*>(pb)) // true {
pd2->get_price(); // calls Base::get_price()
pd2->get_rate(); // calls Derived::get_rate()

[Code] ....

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C++ :: Modify A Member By Static Cast Cause Segmentation Fault

Feb 26, 2013

I have the next program: if I comment the assignation mNum=num; or mCh=ch the segmentation fault don't exist.

#include <vector>
class Base{
public:

[Code]....

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C# :: How To Properly Handle Thread Failures

Feb 9, 2015

I have an application that uses an array of threads to call a method along with thread.join(). I was just wondering what would be the best way to handle the thread in case if one of the thread fails? Should I put a try catch block on the method that is being called or should I put the try catch block on the array of threads, or is there any other proper way to handle failed threads?

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C++ :: Do Static Functions Have Access To Non Static Data Members Of A Class

Apr 17, 2013

From my book:

"A static function might have this prototype:

static void Afunction(int n);

A static function can be called in relation to a particular object by a statement such as the following:

aBox.Afunction(10);

The function has no access to the non-static members of aBox. The same function could also be called without reference to an object. In this case, the statement would be:

CBox::Afunction(10);

where CBox is the class name. Using the class name and the scope resolution operator tells the compiler to which class Afunction() belongs."

Why exactly cant Afunction access non-static members?

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C++ :: Accessing Non-static Members Inside Static Member Functions

Sep 11, 2013

What are the workarounds for accessing the non-static member variables of some class(Say A) inside static member functions of another class(Say B)? I am coding in c++. Class A is derived with public properties of class B. Any pointers?

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C# :: Static Method Inside Non-static Class

Aug 22, 2014

Have following code:

class Program
{
static void Main(string[] args)
{

[Code]....

My question according to what i just wrote:

1. Is that mean that Do() is only available for use by Dog itself because Dog is 'oryginal' Dog, and if i create new dogs - instances of oryginal Dog (dog1, dog2 ...) they cant access because Do is only available fo 'oryginal' one? Is that correct thinking?

2. If i would want to have something common (e.g value) for all dogs is that good way to create static field/method for Dog instead of non-static once then all instances of Dog would access Dog static member to get/change it? Just stupid example: static method GetAmountOfLegs() which return 4 Then all instances can take/call that value from Dog. Is that correct thinking?

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C++ :: Difference Between Static Local Variable And Static Global Variable?

Aug 5, 2013

Here is the code,

Code:
class A {
};
A& CreateObject() {
static A a;
return a;
} static A aa;
int main() {
return 0;
}

So is there any difference between a defined in CreateObject and aa?

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C :: Cast Int To Char

Oct 2, 2014

Is it possible to get the string representation of an int. So I mean if i have: 5, I want to get '5'.

I was searching in the internet and I found this solution:

Code:
int number = 5;
char c = number + '0'; which works fine for small numbers, but if I do:
Code: int i;
char c;
for(i =0; i < 10000; i++) {
c = i + '0';
printf("%c
", c);
}

At some point some strange sings like %&/)/)$%&) are appearing, But i really need this huge numbers as well .. Is there any other way to do this??

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C++ :: Cast Int To A String

Sep 29, 2013

How to cast an int to a string I came across this code:

#include <iostream>
#include <string>
int main(){
double f = 23.43;
std::string f_str = std::to_string(f);
std::cout << f_str << '
';
}

Unfortunately, using Dev C++ Version 5.4.2, I'm getting an error:

[Error] 'to_string is not a member of 'std'

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C :: Cast Of The Pointer To Array

Dec 7, 2013

In my refference book I have got a example with a part saying to access the a[4][0] element of the array (named a) with pointer this can be written:

*((int*)a+4)

I wonder if the cast is really required. The book says it is required so that the pointer arithmetic can be done properly. However I am not sure about it. When I work with pointers defined by myself I don't use casts similar to this one. Is there a difference between a self defined pointer and array name?

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C :: Type Cast To Char

May 7, 2014

I have this program.

Code:
int test_variable;
int main() {
test_variable = (int)0x12;
}

Now my doubt is what is the advantage of type casting 0x12 to int. suppose if the test_variable data type is "char" then should i type cast to "char"?

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C# :: Limitation Of Array Cast

Mar 14, 2012

Code:

namespace ConsoleApplication1 {
class ImplicitlyConvertibleFromFoo {
public ImplicitlyConvertibleFromFoo(Foo foo) {
this.foo = foo;
}
Foo foo;

[code]....

Any way to easily convert arrays of user-defined types?

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C++ :: Dynamic Cast With Reference

Jun 20, 2013

Here is the code,

Code:
class B {
};
class D1:public B {
};
class D2:public D1 {
};

int main() {
B& b = dynamic_cast<B&>(*(new D2));
return 0;
}

D2 is actually grandchild of B, so D2 object reference can still be converted to B reference without any exception. Is it legal?

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C++ :: Forceful Type Cast Not Working

Mar 6, 2015

I am writing a program with FLTK and in event handling part wanted to send the address of the handler function to callback function. Type cast just does not work.

Code: btnOpenDB->callback(&FLUI::WndMain::DBOpenBtnClick_scb, reinterpret_cast<void*>(&WndMain::DBOpenBtnClick_cb));

I want to cast "a pointer to a class member function which accepts one argument" to a void pointer. After all it is just an address. So it is logically possible to cast it. Isn't it? Actually an static_cast should be enough!

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C :: Makes Integer From Pointer Without Cast

Mar 18, 2013

The warning: :63:7: warning: passing argument 1 of fputc makes integer from pointer without a cast [enabled by default]

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>

[Code]....

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C :: Making Integer From Pointer Without A Cast

Dec 15, 2013

Code:
#include <stdio.h>
#include <stdlib.h>
#define CLASS 4
#define STUDENT 11
#define GRADE 5

[Code] ....

Giving me that error on 75:10
avesub+=grade[k];
and 90:17
donkeypunch+=grade[j][k];

not sure exactly why

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C :: Cast To Character Pointer For Printf

Apr 18, 2014

I cannot get the following to compile. The problem is the printf on the last line. I understand that printf requires a char (or pointer to char). I understand that I can convert between datatypes by putting the target data type in parenthises in front of the variable. But how do I cast the integer into a character and then get it's pointer to pass into printf?

Following is my code. I compile with gcc temp.c -o temp.

Note that I have tried many attempts at that last line and this is just the one that I really, really think should work (or is at least the closest to the correct answer).

This code shown below, using printf("%s", &(char)nextChar); returns

temp.c:26: error: lvalue required as unary '&' operand

If I try to use printf("%s", *(char)nextChar); I get the error

temp.c:26: error: invalid type argument of 'unary *' (have 'int')

This line printf("%s", (char)nextChar); returns the obvious

format '%s' expects type 'char *', but argument 2 has type 'int'

Code:

#include <stdio.h>
int main() {
printf("hello, world
");
#if defined(SUNDIALS_EXTENDED_PRECISION)

[Code] ....

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C++ :: Can't Find A Cast To Work For Conversion

Apr 10, 2015

I have a library function with a prototype:

Code:
void func(unsigned char* in);

I would like to pass a std::string to it, so I tried:

Code:
std::string temp = "Hello!";
func((unsigned char*)temp.c_str());

This works, but I thought it was good practice for type safety to use C++ style casting, yet reinterpret_cast does not work in this instance as it fails:

ERROR: reinterpret_cast can not cast away const or other type qualifiers

and const_cast fails with:

ERROR: a const_cast can only adjust type qualifiers, it cannot change the underlying type

So what is the correct method of casting here assuming I can not change the library interface, and my data is kept in an std::string?

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C++ :: Cast Directly Between Base Classes Of Object?

Jul 1, 2013

I've got two classes, which are both derived from the same two base classes. Here's a representation of the actual code:

Code: #include <vector>
class BaseClassA {
};
class BaseClassB {
};
class TestClassX
: public BaseClassA,
public BaseClassB

[code].....

Basically, I'd like to know if it is possible to cast directly from a BaseClassA pointer to a BaseClassB pointer, without casting to the child class first.

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C/C++ :: Warning - Cast From Pointer To Integer Of Different Size

Jan 23, 2014

int hash = 0;
char *strings[100];
if((int)strings[i] != 0)
if((int) strings[hash] != 0)
while((int) strings[hash] != 0)
if((int)strings[hash] != 0)
if((int)strings[hash] != 0)

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C/C++ :: Automatic Cast Object To OpenGL Handle / ID

Oct 24, 2014

I programming currently something with OpenGL. Now I have written some wrapper classes, like Shader, Program .... All works fine, but I don't like to call Shader.GetHandle() every time I want to call a OpenGL function manually where I need the object handle/id. (GetHandle() returns the OpenGL ID of the object)

So now I wonder, is it possible to program it in C++ so, that I can put my objects to gl methods and c++ automatically pass the handle/id member to that function ? Is there maybe a operator that I can use for that?

For example:

The way I do it now:

Shader vertexShader();
glCompileShader(vertexShader.GetHandle());

The way I want to:

Shader vertexShader;
glCompileShader(vertexShader);

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C Sharp :: Type Cast Array From Int To Long

Aug 1, 2012

my array contains elements of integer type

how can i convert my array to long array

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C :: Passing Argument 1 Makes Pointer From Integer Without A Cast

Mar 6, 2015

Code:
#include<stdio.h>
print_int_ptr(int *a){

printf(" a %i
" ,a);
printf(" &a %i
" ,&a);

[Code] .....

I get that warning : passing arg 1 of `print_int_ptr' makes pointer from integer without a cast|

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C :: Passing Arg 1 Of Strcmp Makes Pointer From Integer Without Cast

Jan 18, 2015

Code:

#include <stdio.h>
int main(){
int a=15 ;
int b =20 ;
strcmp((a, "20") == 0) {
printf("Correct!");

[Code] .....

passing arg 1 of `strcmp' makes pointer from integer without a cast

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C :: Passing Argument 1 Makes Integer From Pointer Without A Cast

Mar 26, 2014

I am having some errors with pointers and passing arguments.

Code:

#include <stdlib.h>
#include <stdio.h>
#define MAX_FILE_LENGTH 20
typedef struct node_{
int value;
struct node_* next;

[Code]....

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