C / C++ / MFC

mjackson11 wrote:

When I try to define setID in the derived class

template<class _ty=""> void fwdCurve<_Ty>::setID(dbID id)

I get a C2244:   indexedObject::setID : unable to match function definition to an existing declaration

mjackson11 wrote:

I am able to work around this by declaring setID() in the derived class definition and explicitly calling the base class method but why is this happening?

mjackson11 wrote:

If I define setID in the derived class declaration, when I implement it, it does not call the base class setID method. Seems like the compiler is defining them as two different methods instead of the derived class inhereting.

#include <iostream>

class Base
{
public:
   void A() { std::cout << "Base::A\n"; }
   void B() { std::cout << "Base::A\n"; }
   virtual void C() { std::cout << "Base::C\n"; }
};

class Derived : public Base
{
public:
   void A() { std::cout << "Derived::A\n"; }
   virtual void C() { std::cout << "Derived::C\n"; }
};

void VirtualTest(Base* pBase, const char* objName)
{
   std::cout << "Calling pBase->A() with pBase = " << objName << "...\n";
   pBase->A();
   std::cout << "Calling pBase->C() with pBase = " << objName << "...\n";
   pBase->C();
}

int main(int, char**)
{
   Base base;
   Derived derived;

   std::cout << "Calling base.A()...\n";
   base.A();
   std::cout << "Calling base.B()...\n";
   base.B();
   VirtualTest(&base, "&base");

   std::cout << "Calling derived.A()...\n";
   derived.A();
   std::cout << "Calling derived.B()...\n";
   derived.B();
   VirtualTest(&derived, "&derived");
}

Calling base.A()...
Base::A
Calling base.B()...
Base::A
Calling pBase->A() with pBase = &base...
Base::A
Calling pBase->C() with pBase = &base...
Base::C
Calling derived.A()...
Derived::A
Calling derived.B()...
Base::A
Calling pBase->A() with pBase = &derived...
Base::A
Calling pBase->C() with pBase = &derived...
Derived::C

Igor IP wrote:

err,hr while Open(): "0xb7 Cannot create a file when that file already exists"...

Igor IP wrote:

...appears in both cases before and after DoModal().

Igor IP wrote:

if( file.Open( filename, CFile::modeWrite | CFile::modeCreate, &feError ) ) { // Write the file

mathy wrote:

i want generate a random num

<ol>
<li>Create an array containig all the candidate numbers, for instance <code>int value[]={1,2,3,4,5,6,7,8,9,10};</code>,
 initialize a variable that will keep  track of the sequence length, for instance <code>len=10;</code></li>
<li>make an loop for how many numbers you wish to extract, at each cycle</li><ol>
  <li>select an index number via <code>index = (int)( (double)rand() * len / RAND_MAX);</code></li>
  <li>keep the number corrensponding to the index, for instance <code>num = value[index];</code> that is you extracted one.</li>
  <li>swap the index selected with the one at the (the current) bottom of the array, i.e. <code>swap(value[index], value[len-1]);</code></li>
  <li>decrement <code>len</code>;</li>
</ol>
</ol>