I want to find in a vector of Object pointers for a matching object. Here's a sample code to illustrate my problem:
class A {
public:
A(string a):_a(a) {}
bool operator==(const A& p) {
return p._a == _a;
}
private:
string _...

Asked By esrkan

What would be the best way to check that a std::vector is sorted? Is there something faster than a loop checking that v[i]<=v[i+1]? Is it faster/cleaner with iterators? Or is it actually better to just call sort every time (though the "v is already sor...

Asked By rlerallut

What would be the most efficient way to compare two double or two float values?
Simply doing this is not correct:
bool CompareDoubles1 (double A, double B)
{
return A == B;
}
But something like:
bool CompareDoubles2 (double A, double B)
{
diff...

Asked By Alex

What would be the most efficient way to compare two double or two float values?
Simply doing this is not correct:
bool CompareDoubles1 (double A, double B)
{
return A == B;
}
But something like:
bool CompareDoubles2 (double A, double B)
{
diff...

Asked By Alex

I'm looking for an algorithm, or at least theory of operation on how you would find similar text in two or more different strings...
Much like the question posed here: Algorithm to find articles with similar text, the difference being that my text string...

Asked By LarryF

I need a binary search algorithm that is compatible with the C++ STL containers, something like std::binary_search in the standard library's <algorithm> header, but I need it to return the iterator that points at the result, not a simple boolean tel...

Asked By Robert Gould

I need a binary search algorithm that is compatible with the C++ STL containers, something like std::binary_search in the standard library's <algorithm> header, but I need it to return the iterator that points at the result, not a simple boolean tel...

Asked By Robert Gould

If I have a date, how do I calculate the week number for that date within that year?
For example, in 2008, January 1st to January 6th are in week 1 and January 7th to the 13th are in week 2, so if my date was January 10th 2008, my week number would be 2....

Asked By Big GH

If I have a date, how do I calculate the week number for that date within that year?
For example, in 2008, January 1st to January 6th are in week 1 and January 7th to the 13th are in week 2, so if my date was January 10th 2008, my week number would be 2....

Asked By Big GH

I'm trying to find an efficient C++ interval tree implementation (mostly likely based on red black trees) without a viral or restrictive license. Any pointers to a clean lightweight standalone implementation? For the use case I have in mind, the set of in...

Asked By Christophe Lambert

I need to find the smallest power of two that's greater or equal to a given value. So far, I have this:
int value = 3221; // 3221 is just an example, could be any number
int result = 1;
while (result < value) result <<= 1;
It works fine, but ...

Asked By Boyan

I need to find the smallest power of two that's greater or equal to a given value. So far, I have this:
int value = 3221; // 3221 is just an example, could be any number
int result = 1;
while (result < value) result <<= 1;
It works fine, but ...

Asked By Boyan

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 h...

Asked By Rob Burke

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 h...

Asked By Rob Burke

Can anyone point me in the right direction of some facial recognition libraries & algorithms ? I've tried searching/googling but i mostly find thesises and very little real software.

Asked By thr

I need a function like this:
// return true iff 'n' is a power of 2, e.g.
// is_power_of_2(16) => true is_power_of_2(3) => false
bool is_power_of_2(int n);
Can anyone suggest how I could write this? Can you tell me a good web site where this sor...

Asked By Ant

I have lots of unrelated named things that I'd like to do quick searches against. An "aardvark" is always an "aardvark" everywhere, so hashing the string and reusing the integer would work well to speed up comparisons. The entire set of names is unknown (...

Asked By Jason Citron

I have lots of unrelated named things that I'd like to do quick searches against. An "aardvark" is always an "aardvark" everywhere, so hashing the string and reusing the integer would work well to speed up comparisons. The entire set of names is unknown (...

Asked By Jason Citron

I need a function like this:
// return true iff 'n' is a power of 2, e.g.
// is_power_of_2(16) => true is_power_of_2(3) => false
bool is_power_of_2(int n);
Can anyone suggest how I could write this? Can you tell me a good web site where this sor...

Asked By Ant

I'm trying to create a randomized maze in C++, but I can't start because I don't know how to create grids or cells. How could I create it? And I also want to create it using ASCII characters. how can i store it in array? (can any one give a sample code an...

Asked By jessemiel