There are operator classes in STL like less, equal_to, greater_equal etc.How to easily comb开发者_如何学运维ine them to use with for example remove_if function?
What I mean is - we know that the std::map\'s elements are sorted according to the keys. So, let\'s say the keys are integers. If I iterate from std::map::begin() to std::map::end() using a for, does
for user defined struct, as I understand, it\'s easy. Just overload the operator <. However, for int/float etc.., do I really need to overload operator < for int?
Memory usage in my STL containers is projected to be volatile - that is to say it will frequently shrink and grow.I\'m thinking to account for this by specifying an allocator to the STL container type
As far as the algorithm is concerned, removing a set of element from a contiguous array can be done effectively in two parts.
map<T,Z> m= .开发者_开发百科..; vector<T> v; v.reserve(m.size); for(map<T,Z>::iterator it=m.begin();it!=m.end();++it)
Often, you have a map like map<string,X> where the key is the name of the mapped value, and you need an API which lets consumers see all the names... to populate a GUI list-box for example.
I know hash_set is non-standard and unordered_set is standard. However, I am wondering, performance wise, what is the difference between the 开发者_高级运维two? Why do they exist separately?The comple
I am trying to understand how to read information form an input file and write that data into an output file. I understand how to read from a file and dispaly its contents, but I DONT understand how t
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