Okay i am working on someone elses code. They do alot of this: char description[256]; description[0]=0; I know this would put a \0 in the first spot of the character array. But is this even a safe way to erase a string? Also visual studio keeps reporting memory leaks, and i've pretty much tied this done to the strings that are used. ...
We get an abort when a C++ exception is thrown when running code compiled with -pthread. Platform: AIX 5.3 technical level 8 Compiler: gcc 3.4.6 Linker: AIX linker 1.65.2.4 Test Code: // exception.cpp #include <iostream> class MyException { public: MyException(){} virtual ~MyException(){}; }; void gTest() { t...
// A Mutex allows threads mutually exclusive access to a resource. //----------------------------------------------------------------------- class Mutex { private: CRITICAL_SECTION m_mutex; public: Mutex() { InitializeCriticalSection(&m_mutex); } ~Mutex() { DeleteCriticalSection(&m_mutex); } void acquire() { Enter...
Assume I have a function like this: MyClass &MyFunction(void) { static MyClass *ptr = 0; if (ptr == 0) ptr = new MyClass; return MyClass; } The question is at program exit time, will the ptr variable ever become invalid (i.e. the contents of that ptr are cleaned up by the exiting process)? I realize that this function leaks,...
When measuring network latency (time ack received - time msg sent) in any protocol over TCP, what timer would you recommend to use and why? What resolution does it have? What are other advantages/disadvantages? Optional: how does it work? Optional: what timer would you NOT use and why? I'm looking mostly for Windows / C++ solutions, b...
Environment: I'm working on a C++ application that uses SQL Native Client 9.0 to communicate with a SQL Server 2000 database. Scenario: 2 connections are opened to the DBMS Each connection is set to use transactions A query on Connection1 works with TableA A query on Connection2 works with TableB TableB has a foreign key constraint o...
Does ODBC support asynchronous calls? If it does, then can you tell me about any reference materials? My preferred language is C++. ...
I want to be able to read from an unsorted source text file (a record in each line), and insert the line/record into a destination text file by specifying the line number where it should be inserted. It will be determined where to insert the line/record into the destination file by comparing the incoming line from the source file to the...
I usually, almost without thinking anymore, use forward declarations so that I won't have to include headers. Something along this example: //----------------------- // foo.h //----------------------- class foo { foo(); ~foo(); }; //----------------------- // bar.h //----------------------- class foo; // forward declaration cl...
Hi folks, I am trying to write a C++ program that takes the following inputs from the user to construct rectangles (between 2 and 5): height, width, x-pos, y-pos. All of these rectangles will exist parallel to the x and the y axis, that is all of their edges will have slopes of 0 or infinity. I've tried to implement what is mentioned i...
How do you get a list of files within a directory so each can be processed? ...
I'm trying to figure out how to write this function: template <typename Bound> Bound::result_type callFromAnyList(Bound b, list<any> p) { } Then, if I had some function: double myFunc(string s, int i) { return -3.0; } I could call it by doing something like this: list<any> p; p.push_back((string)"Hello"); p.push_back(7); doubl...
What is the shortest chunk of C++ you can come up with to safely clean up a vector or list of pointers? (assuming you have to call delete on the pointers?) list<Foo*> foo_list; I'd rather not use Boost or wrap my pointers with smart pointers. ...
Ok, one for the SO hive mind... I have code which has - until today - run just fine on many systems and is deployed at many sites. It involves threads reading and writing data from a serial port. Trying to check out a new device, my code was swamped with 995 ERROR_OPERATION_ABORTED errors calling GetOverlappedResult after the ReadFil...
Is it possible to forward declare an STL container in a header file? For example, take the following code: #include <vector> class Foo { private: std::vector<int> container_; ... }; I want to be able to do something like this: namespace std { template <typename T> class vector; } class Foo { private: std::vector<in...
I just ran across the following error (and found the solution online, but it's not present in Stack Overflow): (.gnu.linkonce.[stuff]): undefined reference to [method] [object file]:(.gnu.linkonce.[stuff]): undefined reference to `typeinfo for [classname]' Why might one get one of these "undefined reference to typeinfo" lin...
Hi, I'm trying to get this: //C.h #ifndef C_H #define C_H #include "c.h" class C { public: C(); int function(int, int); }; #endif which is defined in this: //c.cpp #include "c.h" C::C() { } int C::function(int a, int b) { return a * b; } to work in this: //crp.cpp #include <iostream> #include "c.h" void main(vo...
The strtok_s function exists in vc8 but not in vc7. So what's a function (or code) that does the equivalent of strtok_s in vc7? ...
Background I have an application written in native C++ over the course of several years that is around 60 KLOC. There are many many functions and classes that are dead (probably 10-15% like the similar Unix based question below asked). We recently began doing unit testing on all new code and applying it to modified code whenever possibl...
I have a class that only really ever needed by classes in a certain class hierarchy. I wanted to know if it is possible to nest the class in the highest class's protected section and have all the other classes automatically inherit it? ...