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What is a “callback” in C and how are they implemented?
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There is no "callback" in C - not more than any other generic programming concept.
They're implemented using function pointers. Here's an example:
void populate_array(int *array, size_t arraySize, int (*getNextValue)(void))
{
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Does Javascript pass by reference? [duplicate]
Does Javascript pass by references or pass by values? Here is an example from Javascript: The Good Parts . I am very confused about my parameter for the rectangle function. It is actually undefined , and redefined inside the function. There are no original reference. If I remove it from the func...
'const int' vs. 'int const' as function parameters in C++ and C
...e identical. With pointer types it becomes more complicated:
const char* is a pointer to a constant char
char const* is a pointer to a constant char
char* const is a constant pointer to a (mutable) char
In other words, (1) and (2) are identical. The only way of making the pointer (rather than th...
What exactly are iterator, iterable, and iteration?
What is the most basic definition of "iterable", "iterator" and "iteration" in Python?
13 Answers
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What can MATLAB do that R cannot do? [closed]
... licenses are. Then I wonder why they don't just use Octave or R . But is the latter right? Can you use R to replace MATLAB?
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What is Type-safe?
...an integer in a string
String one = 1;
// Also fails.
int foo = "bar";
This also applies to method arguments, since you are passing explicit types to them:
int AddTwoNumbers(int a, int b)
{
return a + b;
}
If I tried to call that using:
int Sum = AddTwoNumbers(5, "5");
The compiler would...
Checking for empty queryset in Django
What is the recommended idiom for checking whether a query returned any results?
Example:
7 Answers
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Why is === faster than == in PHP?
Why is === faster than == in PHP?
11 Answers
11
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Curious null-coalescing operator custom implicit conversion behaviour
Note: this appears to have been fixed in Roslyn
5 Answers
5
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How different is Objective-C from C++? [closed]
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Short list of some of the major differences:
C++ allows multiple inheritance, Objective-C doesn't.
Unlike C++, Objective-C allows method parameters to be named and the method signature includes only the names and types of the para...