C / C++ Forum

What is the differnce in these new operators char *a = new char; char *a = new char(21); Do the type of brac matter ?.. If yes what do they signify ?..

Hi, In pursuit of a child class blocking a parent's virtual method, I came up with this example: #include <iostream> #include <cstdio> using namespace std; class Grandparent

Hi, I have a question, if I have a global function that pointed to class or object, then how do I pass arguments to that function. I have CService *MyService; in my cpp and in my header, i have static DWORD CALLBACK function(CService*, DWORD, LPVOID); DWORD func(CService*, DWORD); then how do i pass argument for that pointer.

Hello, just a simple question: Does the close() method of an ofstream object always flush the buffer? Thanks for answers. Phil

Hi, GNU g++ 3.4 detects an error in code below. What is wrong here? --------- foo.cpp : BEGIN --------- template <typename T> struct Foo {

Hi, I'm trying to create a class template like the following: template <class Type> class MyVector { MyVector(); ~MyVector(); unsigned int MyCount; Type* MyData;

I don't really understand the details of what happens when a compiler inlines a given function. I know that basically it's supposed to cause the function to be placed directly on the stack per invocation (or something like that.) That would be in contrast to loading one instance of the function and branching to it each time. I don't...

Given this situation: class Base { public: virtual ~Base(); virtual bool equals(Base const&) const = 0; };

I am currently in India and have treated myself to the Indian reprint of O'Reilly's "C++ In A Nutshell". (Books in India come in at 1/3 to 1/2 of the price in Britain.) I thought that I would have a look at what Chapter 12 on grammar says about Declarations and Definitions. Now I'm more baffled than when I started. Here's the problem.

Hi I am creating my own Queue class to learn about Queues and pointers. I have come across a question of two styles and I don't know if there are any dangers associated with them. I coded my remove function as follows template <class T>

1: #include <iostream> 2: 3: typedef struct { 4: double r; 5: double i; 6: } complex; .. .. .. 24: ostream & operator<< (ostream &str, const complex &a)

What does this C++ line mean? bool bBoolean = (0!=(nInteger&0x08)); I don't understand the nInteger&0x08 bit. Thanks, Valentina

Hi All, The simple test program at the end of this message defines a class template foo with a member function bar implemented by delegating to a static member function of a specialization of the class template bar_impl, nested within foo. The template bar_impl is partially specialized outside of foo. My question is which specialization...

Hi! GCC compiler produces: test2.cc: In function `int main()': test2.cc:17: no match for `CTest<char, 1>& + CTest<char, 2>&' operator when compiling text: 01 template<class T, int S>

hi, i'm trying to get a board with relays working under c++, i have a sample code in visual basic to compose a string that is send to the serial port but i am confused how to translate it to a c++ string here is the vb code: messagestring = Chr$(13) & Chr$(address) & "S6" & Chr$(checksum) where adress is an integer from 1 to 255 and...

I have a piece of software - it compiles fine using nmake (started from cygwin, using visual c++). The output of nmake explorernodequery.dll is: ---------------------------------------------------------- Microsoft (R) Program Maintenance Utility Version 7.10.3077 Copyright (C) Microsoft Corporation. All rights reserved.

Is this possible: class base; class derived; //:public base vector <base*> bList; vector<derived*> dList; //add some derived class pointer entries to dList;

Hello, I made a class which works like bool primitive but has some special properties. Now I want to be able to overload an operator to be able to do the following: while (myObj) { ....

Hi all; I don't think this is a VC compiler question, so I am asking this here. I did hunt around the web and Stroustrup before posting, but found no references to this problem. I have a base class (BasePort) that defines an interface for subclasses (LPort, NPort). Each implementation of BasePort as LPort or NPort requires a default...

While thunbing through _C++ Templates, The Complete Guide_ (reckon I aught to read it?) I came across a discussion of using templates to "unroll" loops. I thought that looked like a good idea, so I decided to try it on some code I'm writing. The idea is to use template objects to perform what happens in traditional nested for() loops. ...

I have a compiler error when using a non-dependent type declared in a template, if I use the type in function definitions. I think it is a parsing issues related to confusion with a typename. Below I have a simple example. Is there another solution I should be using instead of declaring the type outside of the template? Thanks, JT

System: Pentium 4, Win32, gcc 3.3.3 cygwin Does anyone know of a mechanism whereby C library functions can be made to throw a (C++) exception in case a call fails? This would obviate having to check the results of function calls individually at the point of call. I would also be nice to be able to specify that (some) floating point IEEE...

Hi all, I'm trying to create a vector of pointers to a class: For example: class CMb ... std::vector< CMb* > myvect(100);

HY, my problem is the following: I want to give a very big application the ability, to change the language at runtime. It's written in Visual C++ 6.0. All language depending strings and so on, are already stored in different resource-dll's. The way, I understand it, there is a list of resources, which the application goes through,...

It seems that the following code is not valid, but I need to find a workaround. Both gcc and Comeau tells me that j can't be used as a template argument, even though it's declared as a const unsigned. Is there a way to get around this? template< unsigned M > class Tree { public: Tree()