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What is a “callback” in C and how are they implemented?
...y 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))
{
for (size_t i=0; i<arraySize; i++)
array[i] = getNextValue();
}
int getNextRandomValue(void)
{
ret...
Get all Attributes from a HTML element with Javascript/jQuery
...
Use .slice to convert the attributes property to Array
The attributes property of DOM nodes is a NamedNodeMap, which is an Array-like object.
An Array-like object is an object which has a length property and whose property names are enum...
'0000-00-00 00:00:00' can not be represented as java.sql.Timestamp error
...ration:
jdbc:mysql://yourserver:3306/yourdatabase?zeroDateTimeBehavior=convertToNull
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When should I make explicit use of the `this` pointer?
...ired.
Consider the following code:
template<class T>
struct A {
int i;
};
template<class T>
struct B : A<T> {
int foo() {
return this->i;
}
};
int main() {
B<int> b;
b.foo();
}
If you omit this->, the compiler does not know how to trea...
Sending Arguments To Background Worker?
Let's say I want to sent an int parameter to a background worker, how can this be accomplished?
8 Answers
...
C++ Tuple vs Struct
...e first start with a default struct and a tuple.
struct StructData {
int X;
int Y;
double Cost;
std::string Label;
bool operator==(const StructData &rhs) {
return std::tie(X,Y,Cost, Label) == std::tie(rhs.X, rhs.Y, rhs.Cost, rhs.Label);
}
bool operator<...
How many constructor arguments is too many?
...
Two design approaches to consider
The essence pattern
The fluent interface pattern
These are both similar in intent, in that we slowly build up an intermediate object, and then create our target object in a single step.
An example of the fluent interface in action would be:
public class...
Access an arbitrary element in a dictionary in Python
...ction() results do not support indexing, this is why first of all we must convert it into a list and then we can use the index [0]
– Noki
May 24 '19 at 9:41
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How do I find out which process is locking a file using .NET?
...
Good point. This wasn't a problem with the deployment script (used internally), but would be in other scenarios.
– orip
Jan 5 '12 at 10:54
...
Connecting overloaded signals and slots in Qt 5
...m having trouble getting to grips with the new signal/slot syntax (using pointer to member function) in Qt 5, as described in New Signal Slot Syntax . I tried changing this:
...