C / C++ Forum

Hi I note there are two functions putch() and _putch() in VC++ Library. Which one should be used under specified situation. What is the difference between putch() and _putch()? Thanks!

Hi, I have a file descriptor of an open file and I would like to know through C/C++ API how to query its read/write/exec permissions. Thanks.

Hi, I'm holding a vector of boost::filesystem::pathS and a vector of pointers to them. I use the reserve member function on both to reserve space for 500 files. That means, for the 501th file added, the vector will grow to hold 1000 files right? Well, as soon as this happens I am getting a segmentation fault. I'm sure this is the reason,...

hi all me Pratts wants to have my account in Gmail but i am not having the invitation for this . if any one can invite me for this it will be a great help. take care byEEEEEEEEEEEEEEEEeee

Hi! I am a newbie in C++, it seems compiler must see the source code of template classes(with .h files and .cpp files£©when compile. I want to prevent others from getting .cpp files. How should i do? Thanks!

bool isOlderThanToday(const char* pDate) { // How to do this? } void main() { const char* pDate = "29-Feb-2005"; if (isOlderThanToday(pDate))

I'm trying to interoperate between file IO operations, on an open file, between unmanaged C++ code and Managed C++, using the .NET framework. Basically, at present, I have a C-style FILE* object, with an open file. I would like to do some operations on this file, then while it's still open, convert it into a .NET FileStream and do some...

Hi! I need to write a template function which accepts a pointer (and a parameter for the byte-offset between the elements and a parameter for the number of elements.). The different possible types which the pointer is pointing at can be for example:

Hello, struct S{ friend class B; private: int i; }; class B{ B(){}

Yet another question... I have a container (vector say) containing my class objects. I've overloaded the less than operator in my class definition to allow sorting based on a certain attribute of the class. Now this is exactly what I need, most of the time. I've found a couple of instances where I would like to be able to sort (using the...

The following simplified code reproduces my problem: #include <iostream> struct MyTypeHolder { typedef int MyType; }; struct MyOp

My apologies in advance if any one is offended by this post. I have an unstable job in a start up company and thought of sharpening my skill sets. I noticed that many companies are asking for boost and austria C++ library knowledge. I am thinking of using that in my project/learning them. For the past 20 months , I developed a fairly...

Hello all, I have a class that contains a large number of discrete pieces of state information. Any combination of these member variables might be valid for a given object. Any given member variable might be used or unused in a given object. For each field, there is a FieldIsValid() member function that must be called before accessing or...

i have a .cpp file and i want to have my class and member functions in a seperate file. if i put the class heading file in a .h and the member functions for the class in a .cpp. how do i compile the 2 .cpp files eg 1 with class stuff and other main(). i know i include the .h file in the .cpp class member file but i cant compile the project...

hello people i. can anybody help me, i dont know what is wrong with this class. it has something to do with the me trying to override the input output stream. if i dont override it, it works fine. i would forget overriding it but i have to do it because its a coursework. here is a simple version of the class #include <iostream> #include...

This isn't exactly a language question, but I'm curious if any of the veteran programmers out there could recommend a static analysis tool for C++. Specifically, I'm looking for something that can flag unreachable code, possible security errors like buffer overflows, and identify unused entities. It would also be great if said tool could...

Several C++ compilers now allow precompiled headers, supposedly as a compile-time optimization. I personally do not use them, although I code mostly in VC++ (which has a tendency to shove PCH down your throat), because: a. When headers are lumped together into one huge entity the code loses a sense of who-uses-what, or so it seems to me. I...

What is purpose of rdbuf methode of stream class? Is rdbuf create new buffer or just return some kind of pointer to existing? Thanks, Zaharije Pasalic

#include <stdint.h> class uint128bit { public: uint64_t bits0to63; uint64_t bits64to127; uint128bit operator= (uint128bit op2) { bits0to63 = op2.bits0to63; bits64to127 = op2.bits64to127; return *this; }

Hi there, I'm having a struggle with GNU g++ (3.3.5) and inheritance of typedefs in STL containers. I'm trying to port some old code I wrote with MS Visual C++ and it looks like there is a discrepancy in the STL implementation or at least interpretation of the standard (I trust g++ most on the latter). To the case: While this compiles...

Hello. Is a static Variable in a member function of a class static with regard to one object, or is it static for all objects of the class? That is: class A { // ... void func() {

Hi there, I'm trying to overload insertion (<<) and extraction (>>) operators and the program yields output I didn't expect. Could someone please clarify what's wrong with my program. Thanks, Ceo // program start

I have two vectors of objects, and these objects contain a double, 'ref_mass'. I want to remove the elements in one list from the other. My erase seems to work okay, except that after erasing the objects (successfully), my 'clean' vector is still the same length as the original. And if the vector had a length of 100, and I erase 10, the last...

given: class A { // ... }; class B : public class A { // ... } void some_fun()

Hi everyone, I am quite new here, and actually no so old to C/C++ either. To put things in perspctive I only use C or rather C++ (MSCV 6) to build tool library's (either standard DLL or COM / OCX), so my knowledge is pretty much rudimentary complemented by some experience and a lot of wizard / mfc usage. Now for my problem: