I want to insert 'n' spaces (or any string) at the beginning of a string in C++. Is there any direct way to do this using either std::strings or char* strings? E.g. in Python you could simply do >>> "." * 5 + "lolcat" '.....lolcat' ...
In the following example should I expect that values.size() will be called every time around the loop? In which case it might make sense to introduce a temporary vectorSize variable. Or should a modern compiler be able to optimize the calls away by recognising that the vector size cannot change. double sumVector(const std::vector<double...
Consider these two C++ header cases: Case 1: class Test { public: static int TEST_DATA[]; }; int Test::TEST_DATA[] = { 1, 2, 3, 4 }; Case 2: class Test { public: static int const TEST_DATA[]; }; int const Test::TEST_DATA[] = { 1, 2, 3, 4 }; Is const in the latter case only for self-imposed compile-time checks or does i...
I've been asked to maintain a large C++ codebase full of memory leaks. While poking around, I found out that we have a lot of buffer overflows that lead to the leaks (how it got this bad, I don't ever want to know). I've decided to removing the buffer overflows first, starting with the dangerous functions. What C/C++ functions that are...
I've been asked to maintain a large C++ codebase full of memory leaks. While poking around, I found out that we have a lot of buffer overflows that lead to the leaks (how it got this bad, I don't ever want to know). I've decided to removing the buffer overflows first. To make my bug-hunting easier, what tools can be used to check for bu...
What's the best way to go about creating a vertical and horizontal ruler bars in an SDI app? Would you make it part of the frame or the view? Derive it from CControlBar, or is there a better method? The vertical ruler must also be docked to a pane and not the frame. To make it a little clearer as to what I'm after, imagine the vertic...
I am looking for a pseudo random number generator which would be specialized to work fast when it is given a seed before generating each number. Most generators I have seen so far assume you set seed once and then generate a long sequence of numbers. The only thing which looks somewhat similar to I have seen so far is Perlin Noise, but i...
What's a simple way to implement a c++ Win32 program to... - display an 800x600x24 uncompressed bitmap image - in a window without borders (the only thing visible is the image) - that closes after ten seconds - and doesn't use MFC Thanks in advance for your help! ...
One of the vagaries of my development system (Codegear C++Builder) is that some of the auto-generated headers insist on having... using namespace xyzzy ...statements in them, which impact on my code when I least want or expect it. Is there a way I can somehow cancel/override a previous "using" statement to avoid this. Maybe... unu...
Does any one know how can I convert a BSTR to an int in VC++ 2008 Thanks in advance. ...
I am building an application as a library, but to make sure I can get the output that I'd like, I switched it over to produce an exe. As soon as I did, I got several errors about unresolved external symbols. At first I thought that I didn't have a path set to the 3rd party library that I was referencing, so I added the folder to my pat...
Let's say I have a multithreaded C++ program that handles requests in the form of a function call to handleRequest(string key). Each call to handleRequest occurs in a separate thread, and there are an arbitrarily large number of possible values for key. I want the following behavior: Simultaneous calls to handleRequest(key) are serial...
Will learning C++ help me build native applications with good speed? Will it help me as a programmer, and what are the other benefits? The reason why I want to learn C++ is because I'm disappointed with the UI performances of applications built on top of JVM and .NET. They feel slow, and start slow too. Of course, a really bad programme...
It looks like I had a fundamental misunderstanding about C++ :< I like the polymorphic container solution. Thank you SO, for bringing that to my attention :) So, we have a need to create a relatively generic container type object. It also happens to encapsulate some business related logic. However, we need to store essentially arbitr...
I know I can get this to technically work but I'd like to implement the cleanest possible solution. Here's the situation: I have a managed library which wraps an unmanaged C-style library. The C-style library functionality I'm currently wrapping does some processing involving a list of strings. The library's client code can provide a...
For the XLC compiler, templated code goes in a *.c file. Then when your program is compiled that uses the template functions, the compiler finds the template definisions in the .c file and instantiates them. The problem is that these .c files are not by default included when doing an xlC -qmakedepend to generate the build dependencies....
In C++, static library A is linked into dynamic libraries B and C. If a class, Foo, is used in A which is defined in B, will C link if it doesn't use Foo? I thought the answer was yes, but I am now running into a problem with xlc_r7 where library C says Foo is an undefined symbol, which it is as far as C is concerned. My problem with th...
I've got a Win32 C++ app with a suite of unit tests. After the unit tests have finished running, I'd like a human-readable report on any unfreed memory to be automatically generated. Ideally, the report will have a stack with files & line number info for each unfreed allocation. It would be nice to have them generated in a consistent ...
I have an RFID reader connected to an Arduino board. I'd like to connect to it over its serial interface, and whenever the RFID reader omits a signal ( when it has read an (RF)ID ), I'd like to retrieve it in my C++ program. I already have the code for simply printing the RFID to serial from the Arduino. What I don't know, is how to re...
Would anyone know why MSVC++ 2008 always returns error 5 on GetLastError() when I try to call OpenProcess with PROCESS_ALL_ACCESS as my desired access? PROCESS_VM_READ works just fine. I'm an administrator on this computer and it is working fine in Dev C++. Do I need to set an option somewhere? ...