Hi everyone, For a project, we are required to use a makefile to pull everything together, but our abhorrent professor never showed us how to. I only have ONE file, a3driver.cpp. The driver imports a class from a location "/user/cse232/Examples/example32.sequence.cpp". That's it, everything else is contained with the .cpp. How would ...
I need to create a simple application that doesn't work after 30 days. How can I do that ? Is there a way to use Trial program after 30 days ? ...
In C++ one might use namespace to keep independent groups working in the same code base from inadvertently creating functions with the same name and thus creating a conflict. My question is, before the idea of namespace comes out, how might one emulate namespace in C. ...
Hi, I am always confused about return a string literal or a string from a function. I was told that there might be memory leak because you don't know when the memory will be deleted? For example, in the code below, how to implement foo() so as to make the output of the code is "Hello World"? void foo ( ) // you can a...
At our company one of the core C++ classes (Database connection pointer) is implemented as a reference counting pointer. To be clear, the objects are NOT DB connections themselves, but pointers to a DB connection object. The library is very old, and nobody who designed is around anymore. So far, nether I, nor any C++ experts in the co...
How do I force cpptask to move the static libraries to the end on arg list issued to the compiler? Here is the clause I am using <cpptasks:cc description="appname" subsystem="console" objdir="obj" outfile="dist/app_test"> <compiler refid="testsslcc" /> <linkerarg value="-L${libdir}" /> <l...
memset is sometimes used to initialize data in a constructor like the example below. Does it work in general ? Is it a good idea in general? class A { public: A(); private: int a; float f; char str[35]; long *lp; }; A::A() { memset(this, 0, sizeof(*this)); } ...
There is a line in the 3rd tutorial on Boost asio that shows how to renew a timer and yet prevent there from being drift. The line is the following: t->expires_at(t->expires_at() + boost::posix_time::seconds(1)); Maybe it's me but I wasn't able to find documentation on the 2nd usage of expires_at(), with no parameters. expires_at(x) ...
I'm programming a simple text-based RPG using a switch statement for a game loop. The program works fine until I attempt to add another case statement, at which point it gives me the following three errors: "jump to case label" (error occurs at the line of the newly added case), and two "crosses initialization of 'ClassName *objectName'"...
What's the difference of pData1 and pData2, which are build as follows: pData1 = (int*) calloc (i,sizeof(int)); int * pData2 = (int*) calloc (i,sizeof(int)); ...
[win 32 C++] I don't know how to convert float to LPCWSTR/LPWSTR or LPCWSTR <-> LPWSTR Thanks a lot ...
I'm trying to learn C++ currently, but I'm having issues with the code below. class Vector2 { public: double X; double Y; Vector2(double X, double Y) { this->X = X; this->Y = Y; }; SDL_Rect * getSdlOffset() { SDL_Rect * offset = new SDL_Rect(); offset->x = this->X; of...
I have a fairly serious bug in my program - occasional calls to new() throw a bad_alloc. From the documentation I can find on bad_alloc, it seems to be thrown for these reasons: When the computer runs out of memory (which definitely isn't happening, I have 4GB of RAM, program throws bad_alloc when using less than 5MB (checked in taskm...
I have a process "x" which uses "system" C function to start ntpd daemon. I observed that ntpd are passed the open file descriptors of "x". ntpd holds on to the file descriptors even after original file is deleted. for ex: Some log files used by "x" are rotated out after sometime, but "ntpd" has file handle opened for these deleted file...
Hello everyone :) I've got a bit of a problem. Essentially, I need to store a large list of whitelisted entries inside my program, and I'd like to include such a list directly -- I don't want to have to distribute other libraries and such, and I don't want to embed the strings into a Win32 resource, for a bunch of reasons I don't want t...
I'm on Linux. My code is written in C++. My program is non-interactive; it runs as "./prog input-file", processes the file, and exits. I have various unit tests "input-file0, input-file1, input-file2, ..." For designing new unit tests, I want to know what lines of code existing tests do not cover. Question: Given that I control how "p...
Hi, I am looking for recommendation for object serialization/deserialization library in c++? Which one are the most advanced and open-sourced? Can it handle Any class that users defined? Object hierarchy (parent and child classes)? A Tree of objects? Class A has an attribute of Class B which has an attribute of Class C? STL contain...
So this is probably a long shot, but is there any way to run a C or C++ file as a script? I tried: #!/usr/bin/gcc main.c -o main; ./main int main(){ return 0; } But it says: ./main.c:1:2: error: invalid preprocessing directive #! ...
Hi! I was given a task. First dialog based application has 4 buttons (up, down, left, right). Second dialog based application has two controls (e.g. text area, button). When on the first dialog I click "left" button - controls on the second dialog must move to the left. But unfortunately I don't know Win32 API at all. ...
I'm a bit confused about handling an array of objects in C++, as I can't seem to find information about how they are passed around (reference or value) and how they are stored in an array. I would expect an array of objects to be an array of pointers to that object type, but I haven't found this written anywhere. Would they be pointers,...