Click here to Skip to main content
16,016,570 members
Home / Discussions / C / C++ / MFC
   

C / C++ / MFC

 
Questionwhy passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
Tarun Jha13-May-18 1:46
Tarun Jha13-May-18 1:46 
AnswerRe: why passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
CPallini13-May-18 2:56
mveCPallini13-May-18 2:56 
GeneralRe: why passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
Tarun Jha26-May-18 9:50
Tarun Jha26-May-18 9:50 
GeneralRe: why passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
CPallini26-May-18 10:53
mveCPallini26-May-18 10:53 
Questionproblem encountered by calling constructors explicitly. Pin
Tarun Jha11-May-18 10:20
Tarun Jha11-May-18 10:20 
AnswerRe: problem encountered by calling constructors explicitly. Pin
Joe Woodbury11-May-18 11:39
professionalJoe Woodbury11-May-18 11:39 
GeneralRe: problem encountered by calling constructors explicitly. Pin
Tarun Jha11-May-18 11:57
Tarun Jha11-May-18 11:57 
AnswerRe: problem encountered by calling constructors explicitly. Pin
CPallini12-May-18 4:13
mveCPallini12-May-18 4:13 
Since you know at compile time the array size, why don't you allocate it on the stack?
C++
#include <iostream>
#include <array>
using namespace std;

constexpr size_t SIZE = 3;

class Vector
{
  array<int,SIZE> x{};

public:
  Vector (const array<int,SIZE> & a)
  {
    for (size_t n=0; n<SIZE; ++n)
      x[n] = a[n];
  }

  int operator * (const Vector & v) const
  {
    int result = 0;
    for (size_t n=0; n<SIZE; ++n)
      result += x[n] * v.x[n];
    return result;
  }
  friend ostream & operator << ( ostream & os, const Vector & v);
};

ostream & operator << ( ostream & os, const Vector & v)
{
  for (const auto & i : v.x)
    os << i << " ";
  return os;
}

int main()
{
  array<int, SIZE> x{1,2,3};
  array<int, SIZE> y{6,3,9};

  Vector v1{x};
  Vector v2{y};

  cout << "v1 " << v1 << endl;
  cout << "v2 " << v2 << endl;
  cout << "v1*v2 = " << (v1*v2) << endl;
}

Questionvs2005 Form window Error C2039 Pin
jimNLX11-May-18 6:31
jimNLX11-May-18 6:31 
AnswerRe: vs2005 Form window Error C2039 Pin
Victor Nijegorodov11-May-18 7:23
Victor Nijegorodov11-May-18 7:23 
GeneralRe: vs2005 Form window Error C2039 Pin
jimNLX11-May-18 7:28
jimNLX11-May-18 7:28 
GeneralRe: vs2005 Form window Error C2039 Pin
Victor Nijegorodov11-May-18 8:07
Victor Nijegorodov11-May-18 8:07 
QuestionWhy do I need typecast hex? Pin
Vaclav_11-May-18 5:18
Vaclav_11-May-18 5:18 
AnswerRe: Why do I need typecast hex? Pin
Richard MacCutchan11-May-18 6:25
mveRichard MacCutchan11-May-18 6:25 
GeneralRe: Why do I need typecast hex? Pin
Vaclav_11-May-18 6:34
Vaclav_11-May-18 6:34 
Questionconst char [] and char[] difference question Pin
focusdoit10-May-18 14:26
focusdoit10-May-18 14:26 
QuestionRe: const char [] and char[] difference question Pin
David Crow10-May-18 17:22
David Crow10-May-18 17:22 
AnswerRe: const char [] and char[] difference question Pin
Richard MacCutchan10-May-18 21:25
mveRichard MacCutchan10-May-18 21:25 
AnswerRe: const char [] and char[] difference question Pin
Victor Nijegorodov10-May-18 23:03
Victor Nijegorodov10-May-18 23:03 
GeneralRe: const char [] and char[] difference question Pin
samzcs11-May-18 2:24
samzcs11-May-18 2:24 
QuestionPlease advise me on C++ coding structure Pin
Vaclav_9-May-18 4:24
Vaclav_9-May-18 4:24 
AnswerRe: Please advise me on C++ coding structure Pin
leon de boer9-May-18 4:44
leon de boer9-May-18 4:44 
QuestionHelp with C Pin
Faith Burnett5-May-18 10:28
Faith Burnett5-May-18 10:28 
AnswerRe: Help with C Pin
David Crow5-May-18 16:57
David Crow5-May-18 16:57 
GeneralRe: Help with C Pin
Faith Burnett5-May-18 19:08
Faith Burnett5-May-18 19:08 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.