C / C++ Forum

Hi, I am having a great deal of trouble trying to get ZeosLib (6.1.5 stable) to work with Borland C++ Builder 6. Since there weren't any C++ examples in the base package (http://sourceforge.net/projects/zeoslib/), I Googled for some examples and found these: http://www.baghli.com/bcb_mysql.html#examples

Hello, I have come back to C++ after a couple of years with Java so I am quite rusty and this question may seem poor: My platform is Windows XP with MSVC 7.1. I have a class with a templatized conversion operator defined as follows:

In the course of writing numerical code I needed to convert a float to an int with a defined behavior: if the float is great than INT_MAX, set the int to INT_MAX, otherwise assign directly. The problem I ran into is a float with value INT_MAX assigned to an int results in the value -2147483648 being assigned, but if the conversion takes place...

I've run into a situation where the conventional thinking doesn't seem satisfactory. I have a table of data where each row maps into a struct. I want to put these into a vector. My overall design uses interfaces for everything accessed from outside of the namespace. I also have a class that acts as a wrapper for the structs. For example: ...

I just do not understand this error. Am I misusing dynamic_cast ? What I want to do is to have a single template construct (with no optional argument) so that it works for whatever T I want to use it with. Now, if that T happens to be some subclass of a known base class (object, in this case), I want to perform some extra stuff ... I've...

Hi all, I've been told that Stroustrup's C++ book is a must read, but is subtle and advanced enough that much would be lost to me if I didn't know much of the language ahead of time. I'm already proficient at C, and know enough about C++ to use it as "C with classes". The thought of having to read about the language conditionals and...

Hi, On Cygwin, most of the header files for gcc and g++ used UNIX style line breaks, so I've been replacing these (by copying into Wordpad from Notepad and then copying out again) with Windows-style line breaks. However, this doesn't get rid of instances of character 12 (Form Feed). Is there any reason why it wouldn't be safe to delete...

Is there a string stream I can write into and read from? I've tried std::stringstream but it won't let me read from it. ie I can do this: int iData = 123 std::stringstream ss; ss << 123;

Does anybody know why unsigned char myImage; works but unsigned char myImage; does not? I think its because the second line is a value too big for unsigned char, is this correct? If so:

Profiling has shown that during runtime of my program, 100 million objects of class X are constructed and destructed. What is the best way to optimize in such a case, both for memory and speed (speed maybe more important)? One idea is to make the class very small, to contain only the most important member data, and put everything else,...

I am trying to have a pointer to a member variable, however i will be deriving a number of classes from a base class. Whilst the code below works, i am wondering if there is a better way of doing this, or indeed if there are any traps i am missing. #include <iostream> class BaseClass { public:

Hi all, I know what I need to do if data_ in the code below were a uchar*, but what about when it's an uchar array? Do I need to specify my own copy-constructor and assignment operator? #include <iostream>

Hi, vector<int> v; //... int size = v.size(); Since the vector's size() function returns a "size_t" number, the compilation with /Wp64 reports some warning. My question is: If I can gurantee "size" is not a big number, will the conversion from "size_t" to "int" on 64-bit platforms cause error ?

I am getting the following compilation errors with the following program. My compiler is aCC 03.27 on HP-UX11 - #include <iostream> using namespace std; #include <list> #include <memory> #include <string>

HI,all: I use ofstream of stl to manange a file, but how can I get size of the file? // open file std::ofstream * log = new std::ofstream( "test.log" ); // get size ???

Hello experts! I reading a book called programming with design pattern revealed by Tomasz Muldner and here I read something that sound strange. Here is the whole section: It says" Because inline functions are expanded at compile time, definitions of these functions, unlike other definitions cannot be separately compiled and must be

Hello Experts! I know that to use heap-based objects, the C++ programmer has to define variables that are of pointer types like Car *car = new Car; Now to my question I also read this "to use heap-based objects, the C++ programmer has to define variables that are of either pointer or reference types." Is it really possible to use...

I'm having a compile time problem with g++ 3.2.something, which I can boil down to this: struct A { template<int N> void foo(){} }; template<class T> void fn( int & ) { A a;

on running this program on some linux versions, it does not compile bcc test.cpp --------------------------------------- #include <iostream.h> using namespace std; int main() { std::cout <<"test"; return 0;

Hi! I am a beginner in C++. This is little assignment. It gives an error "Structure Require on Left Side of dot operator" Can anybody help me what went wrong in this code? #include <conio.h> #include <stdio.h> #include <iostream.h> void set(void); void display(void);

By doing: void MyClass::MyFunction() { static int myvar; .... } We can defined a function local variable 'myvar' that keeps its value from call to call (the point is that the variable can not be easily

Hi group, I wonder - can anybody tell me if it is safe to make a union like this: union Event { unsigned char charData; struct { unsigned int channel : 4; unsigned int type : 4;

I know this gets asked all the time but..... I am a fresh grad. I have taken a year of java and 1/2 year of C++ and OO Design and Analysis. I have strong Java skills and I have done projects in c++. But I am pretty sure that I am getting this job as a java/C++ software engineer. I want to put out a good impression since it is with a real...

Hello Would be grateful if someone can make a few things clear for me! I have developed a small app using Java and would like to do the same using C++ but without the need for a runtime environment addition. This is a very samm app and it seems foolish to have to ask the user to install 20 MB of extra software. The app displays an...

Hello I am learning C++, a book exercise is asking to write a C program for the purpose of learning compilation output when compile with c or c++ compiler. the program must use puts() without <stdio.h>. is this a valid C program? #include <iostream.h> int main(){