C / C++ / MFC

www-cs-students.stanford.edu/~sjac/c-to-cpp-info/references[^]:

In C, Pass-by-reference is simulated by passing the address of a variable (a
pointer) and dereferencing that address within the function to read or write
the actual variable. This will be referred to as "C style pass-by-reference."

Jochen Arndt wrote:

But passing by pointer is technically passing by value.

void PassByValue(int foo)
{
    // the value of foo is passed directly and may be manipulated here
    int i = foo + 5;
}

void PassByPointer(int* pFoo)
{
    // the value of foo must first be obtained by dereferencing pFoo
    int foo = *pFoo; // get the value into a local variable
    int i = foo + 5;
}

Jochen Arndt wrote:

pFoo is a value of type int*

void PassByPointer(int* pFoo)
{
    *pFoo += 1;  // manipulates whatever pFoo points to
}

void PassByReference(int& rFoo)
{
    rFoo += 1;  // manipulates whatever rFoo refers (i.e. points) to
}

int PassByeReference(B& Parameter)

 #include <stdio.h>

void f(int &x) { x += 1; }

int main(void)
{
    int n = 1;
    printf("n = %d\n", n);
    f(n);
    printf("n = %d\n", n);

    return 0;
}

Member 868926 wrote:

when a header is clicked:

void MyClass::OnLvnColumnclickList(NMHDR *pNMHDR, LRESULT *pResult)
{
    LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
 
    mCSVListCtrl.DeleteColumn(pNMLV->iSubItem);// This IS getting zero
 
    *pResult = 0;
}

Any ideas?

mCSVListCtrl.DeleteColumn(0);

Victor Nijegorodov wrote:

Just for a test: what will happen if you call

mCSVListCtrl.DeleteColumn(0);

from anywhere but from this MyClass::OnLvnColumnclickList(...) message handler?

Member 868926 wrote:

Any ideas?

AfxCheckMemory[^]

This function works only in the Debug version of MFC.