It wont show any output for the destructor because the destructor is not called until until main exits and the object is destroyed. Remove the system("pause");, which is bad practice anyway and run the program in a way doesn't involve the command prompt disappearing when the program exits (Ctrl-F5 in MSVC or find your IDEs method to run the program rather ... |
Hmmm I can't see a constructor in you CList class which with all those pointer members has to be a bad idea. That aside you appear to have defined you template in a header(h) and a source(cpp) file. Are you trying to compile the cpp file separately? That doesn't work with templates, a template is not a class, it is a ... |
Dear all Hi As you know constructor is a member function with several missions and one of them is "acquiring a resource" and in the same token destructor "releases the resource". Usually after such descriptions, It is said, the resource is like memory, file, lock, semaphore, ... As a matter of fact, resource isn't confined to memory and constructor/destructor do more ... |
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Hi Everyone, I have the following code and i'm able to invoke the destructor explicitly but not the constructor. and i get a compile time error when i invoke the constructor, why is this so? class Trial { public: Trial() { printf("Trial\n"); } ~Trial() { printf("~Trial\n"); } }; int main() { Trial obj; obj.Trial(); // Causes compile time error obj.~Trial(); } ... |
Hi Everyone, I have the following unit to explain the problem that i have, class sample { public : sample() { printf("in sample...\n"); } ~sample() { printf("out sample...\n"); } void invoke(sample obj) { printf("in invoke...\n"); } }; int main() { sample obj; sample obj1; obj1.invoke(obj); printf("...end...\n"); return 0; } The following is the output, in sample... in sample... in invoke... out ... |
Basically Constructors are there to instantiate an object of a defined class. in your example the class is Cat. What this mean is, when your program calls Cat Frisky(5); in the main method, a new instance of Cat is created. How this is done is pretty simple , remember the Cat::Cat(int initialAge) part of your cpp file? This is the code ... |
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Hello, I have a question about constructors and destructors in C++. Assume that I declared a class that has a constructor and virtual destructor like below: class X { X() { printf ("Hi\n"); } virtual ~X() { } } When I derive a class from X called Y, and do not define any constructor or destructor; class Y : public X ... |
On 2006-01-05 14:21:58 -0500, "Michael" said: [color=blue] > Hello, > > I want to use an object (LowCut) within another object > (SampleRateConverter) like it is written as follows: > > class SampleRateConverter > { > public: > SampleRateConverter( int iSourceSampleRate, int iTargetSampleRate ) > { > LowCut = LowPassFilter(dCutoff, 512, BLACKMAN); // here > debugger calls first constructor and ... |
Hi C++ experts, I know this is a very bad programming practice, but I still have to do it. I need to have a vector of MyClass (NOT its pointers for some reason) which behaves like std::string (in fact, much more complicated). If I have thousands of objects like std::string which is stored inside a resizable array, every time when the ... |
Hi, I'm learning how to program in C++, I'm more of a Java programmer. I don't understand the 5th line of the code on the bottom, which is: Sample(int i): num(i) What does the ' : ' do? I thought only inheritance uses a single colon. What does the num(i) do? num is a variable, what does the brackets and the ... |
Well your code won't compile so the question is a bit moot. To get your code to compile you'd have to rewrite it along the lines of the following: class a { a(); ~a(); }; class b { b(); ~b(); }; Unfortunately it won't actually do anything at this point - all you've done is ... |