This question already has answers here:
Why cast unused return values to void?
(10 answers)
What does casting to `void` really do? [duplicate]
(4 answers)
Closed 5 months ago.
I was working and suddenly I faced a function like that:
void func(SomeStruct *parameter) { (void)parameter; }
I could not wrap my head on what it does.
I mean, there is a function func which the only thing it does is (void)parameter; but I can't get what (void)parameter; is doing int this example.
Would someone mind to explain me, please?
Related
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C++ array[index] vs index[array] [duplicate]
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is int[pointer-to-array] in the C++ - standard? [duplicate]
(3 answers)
Closed 2 years ago.
int a[5]={1,2,3,4,5};
int*p=a;
cout<<4[p];
return 0;
can anyone please tell me how it is giving output 5. i know it is 5 because it is the 4th element in the array. but why is 4[p] giving the output!
This question already has answers here:
How does this template magic determine array parameter size?
(3 answers)
Can someone explain this template code that gives me the size of an array? [duplicate]
(4 answers)
How does this "size of array" template function work? [duplicate]
(1 answer)
Closed 2 years ago.
I have come across the following code snippet in C++ and I have no idea what it means;
#include <iostream>
char (&some_function(int (&some_input)));
int main ()
{
// main code here
return 0;
}
How is some_function a function? what kind of syntax is this? where is the body?
I'm sure this is only a C++ syntax as it doesn't compile in C.
Edit:
Actual code with above style:
template <typename T, size_t N>
char (&ArraySizeHelper(T (&array)[N]))[N];
#define arraysize(array) (sizeof(ArraySizeHelper(array)))
This question already has answers here:
What is a lambda expression in C++11?
(10 answers)
Strange bracket-parentheses notation in C++, looking somewhat like a for each loop
(3 answers)
What does "[ this ]" mean in C++
(1 answer)
Closed 2 years ago.
I'm going through Wt web framework tutorial, in one example they initialize a variable this way:
auto greet = [this]{
greeting_->setText("Hello there, " + nameEdit_->text());
};
What does square brackets mean in this type of initialization?
This question already has answers here:
Understand structured binding in C++17 by analogy
(1 answer)
What are the new features in C++17?
(1 answer)
Structured binding and tie()
(2 answers)
Closed 4 years ago.
I read a piece of code from a book but I do not really understand the grammar,
const auto& [local_min, local_max] = minmax(A[i], A[i+1]);
where A is vector of int and local_min and local_max are int.
I know minmax returns a pair, but what does the square brackets do, i.e. [local_min, local_max]? I guess it is not for arrays here.
Thanks.
This question already has an answer here:
Calling C++ method from Objective C
(1 answer)
Closed 6 years ago.
I want to call this function void getResult(char, size_t*) in objective c.How can i do this please help me.
It give me below error show in image.
It seems your getResult function expects to get second parameter by reference. You can't pass function result by reference. Assign it to actual variable first and then pass reference to that.
unsigned long sizeOfC = sizeof(c);
c->getResult(array1, &sizeOfC);