I've clearly been stuck in Java land for too long... Is it possible to do the C++ equivalent of the following Java code: interface Foo {} class Bar implements Foo {} static List<Foo> getFoo() { return new LinkedList<Foo>(); } static List<Bar> getBar() { return new LinkedList<Bar>(); } List<? extends Foo> stuff = getBar(); Wher...
I was give a problem to express any number as sum of 4 prime numbers. Conditions: Not allowed to use any kind of database. Maximum execution time : 3 seconds Numbers only till 100,000 If the splitting is NOT possible, then return -1 What i did : using the sieve of eratosthenes, i calculated all prime numbers till the specified n...
I know this. Calling C function from C++: If my application was in C++ and I had to call functions from a library written in C. Then I would have used //main.cpp extern "C" void C_library_function(int x, int y);//prototype C_library_function(2,4);// directly using it. This wouldn't mangle the name C_library_function and linker wou...
#include <iostream> int& foo() { int i = 6; std::cout << &i << std::endl; //Prints the address of i before return return i; } int main() { int i = foo(); std::cout << i << std::endl; //Prints the value std::cout << &i << std::endl; //Prints the address of i after return } I know it doesn't return the address o...
I'm having a huge block trying to understand "trees" while making a Tic-Tac-Toe bot. I understand the concept, but I can't figure out to implement them. Can someone show me an example of how a tree should be generated for such a case? Or a good tutorial on generating trees? I guess the hard part is generating partial trees. I know how ...
Is it 1 Mb of stack per thread? Or is that just CLR threads? I want to know the memory over head of native windows threads (c++) and CLR threads as view via Task Manager. Thanks ...
Hello. I need fast implementation of popular interpolation algorithms. I figured it out that C# in such simple algorithms will be much slower than C++ so i think of writing some native code and using it in my C# GUI. First of all i run some tests and few operations on 1024x1024x3 matrix took 32ms in C# and 4ms in C++ and that's what i ...
What (if any) are some potential problems with a C++ macro usage like this? Would an inline function be a more appropriate solution? #define EVENT_INFO(_format_, ...) CMyEvent::Generate(__FILE__, __LINE__, CMyEvent::EVT_HIGH, _format_, __VA_ARGS__) void CMyEvent::Generate( const char* file, // filename int ...
Given integer values x and y, C and C++ both return as the quotient q = x/y the floor of the floating point equivalent. I'm interestd in a method of returning the ceiling instead. For example, ceil(10/5) = 2 and ceil(11/5) = 3. The obvious approach involves something like: q = x / y; if (q * y < x) ++q; This requires an extra compar...
If i have a function api that expects a 14 digit input and returns a 6 digit output. I basically define the input as a const char *. would that be the correct and safe thing to do? also why would I not want to just do char * which I could but it seems more prudent to use const char * in that case especially since its an api that i am pr...
We have a body of C++ code which is being ported from a RHEL4-based distro to RHEL-5-based. It used to compile with g++ 3.4.3, and now compiles with g++ 4.1.2. It turns out that there are local POD variables that are being used uninitialized, which is causing failures under the new environment -- not surprising, since C++ rules say that ...
hello. I know I can do this y[i] += f(x[i]) using transform with two input iterators. however it seems somewhat counterintuitive and more complicated than for loop. Is there a more natural way to do so using existing algorithm in boost or Stl. I could not find clean equivalent. here is transform (y = y + a*x): using boost::lambda; t...
I'm reviewing for a test, and I am stumped by this question. Consider the following declarations: enum CategoryType {HUMANITIES, SOCIALSCIENCE, NATURALSCIENCE}; const int NUMCOURSES = 100; struct CourseRec { string courseName; int courseNum; CategoryType courseCategory; }; typedef CourseRec CourseLis...
I am confused about how to use destructors when I have a std::vector of my class. So if I create a simple class as follows: class Test { private: int *big; public: Test () { big = new int[10000]; } ~Test () { delete [] big; } }; Then in my main function I do the following: Test tObj = Test(); vector<Test> tVec; tVec...
Example: switch( x ) { case y: if ( true ) { break; } cout << "Oops"; break; } If the switch statement selects y, will Oops be written to the standard output? - Is break in switch statements a dynamic keyword like continue which can be called under conditions or static like a closing bracket }? ...
If I have the following lines inside a loop: Type *unite = new Type(newSize); or double *array= new double[anySize]; what is the behavior in what concerns to memory if I don't have delete operators inside it? It will be constantly allocating objects and arrays on different memory locations, and therefore memory leaks? ...
I'm trying to send messages to a window that says Ctrl and Up-arrow has been pressed. I've got the basics down, I can send presses of the space key that registeres fine. But I can't seem to get the ctrl+up working. chosen code snippets: [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)] static extern IntPtr SendMess...
whats the logic to find the sum of alternate elements of a two-dimensional matrix. ...
I have a small contest problem in which is given a set of points, in 2D, that form a triangle. This triangle may be subject to an arbitrary rotation, may be subject to an arbitrary translation (both in the 2D plane) and may be subject to a reflection on a mirror, but its dimensions were kept unchanged. Then, they give me a set of points ...
warning lnk4075:ignoring /editandcontinue due to /opt:icp specification error lnk2005: initp+misc_invarg already defined in libcmtd.lib(invarg.obj) i have many more errors lnk2005 all int he libcmt.lib file in the invarg.obj also lnk2098:: defaultlib conflicts with use of other libs. when i had it as debug it was all working i just...