C / C++ / MFC

Member 14968771 wrote:

So what is "QBluetoothAddress" - value or reference?

class myClass;
using mc = myClass &;  // mc is a reference to class myClass
// or
using mc = myClass *; // mc is a reference to class myClass
// or
typedef myClass mc;  // mc is a myClass object
// or even
using mc = myClass && // mc is a rvalue reference 

k5054 wrote:

I lost my copy of K&R a long time ago. My version was pre-ANSI, which meant that there was no void,

Quote:

This class holds a Bluetooth address in a platform- and protocol-independent manner.

void SettingsDialog::pairingDone(QBluetoothAddress& qbaddr, QBluetoothLocalDevice::Pairing& pair)

Member 14968771 wrote:

All I get is "passing by value or by reference" - so what are the parameters actually passed to "pairingDone" ?

Member 14968771 wrote:

point me to good resource to learn something about the syntax

QBluetoothAddress examples

Member 14968771 wrote:

I am NOT and never claim to be an expert in C++.

Member 14968771 wrote:

Here is what I got from Mrs Google example

void SettingsDialog::pairingDone(QBluetoothAddress ,QBluetoothLocalDevice::Pairing)

Member 14968771 wrote:

PLEASE QUIT harassing me about my "lack of basic knowledge" - such continuing (!) harassment just does not fit this forum purpose . ( read how to answer the question INSTRUCTIONS and follow them PLEASE ) I am just learning as I go because I believe that it is better to start with coding a real application and if it does not perform as expected then RTFM and or ask for help.

Member 14968771 wrote:

all I am asking - which way is up and WHY ?

QList<QBluetoothHostInfo> adapters = QBluetoothLocalDevice::allDevices()
for (auto & adapter : adapters) 
{
  // code block to be executed: read/write access to adapter
}

QList<QBluetoothHostInfo> adapters = QBluetoothLocalDevice::allDevices()
for (const auto & adapter : adapters) 
{
  // code block to be executed: read only access to adapter
}

for (int foo : arayOfIntegers)
{
    // each time these lines are executed
    // foo will contain the value of the next tiem in the list
    // until the list is exhausted
}

foreach item in arayOfIntegers
BEGIN
    set foo to the value of the next item in the list
    do stuff with foo
END

void showarray(int *arr)
{
   for(i : arr) 
        std::cout << i << ' ';
   std::cout << '\n';
}

#include <iostream>

int main()
{
    std::cout << "Enter size : ";
    int n;
    std::cin >> n;
    int arr[n];
    for(int i = 0; i < n; ++i) {
        arr[i] = i;
    }
    for( auto x : arr) {
        std::cout << x << ' ';
   }
    std :: cout << '\n';
}

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