If I have an unordered_map<key, someNiceObject>(note someNiceObject is not a pointer)I have an API which inserts a new element, then returns a pointer to someNiceObject now in the map.
I'm trying to find the largest value in a std::map, which would be the last node in the tree (since std::map keys are sorted).
Is the behavior for passing an empty container to std::lower_bound defined?I checked cppreference.com and an old version of the C++ standard that I found online, but couldn't find a definite answer.
As You may (not) know using std::minmax with auto and temporary arguments may be dangerous. Following code for example is UB because std::minmax returns pair of references, not values:
If I have something like:Would STL be able to preallocate space in newVector before processing and adding the new elements? I know it is not a requirement of the algorithm, but would a "good" implementation be able to optimize that? Or, for this kind of case, should I prefer adding...
I have read the doc of std::memory_order_relaxed.One part of explanation of Relaxed ordering is ....and the explanation of this is said ...
I know that STL containers have a value_type parameter and I've seen how it can be used to declare a type of a variable like:
I know that STL containers have a value_type parameter and I've seen how it can be used to declare a type of a variable like
Is there any STL algorithm that would tell if a container has duplicated elements (using the operator== or a given predicate)?
Is there a way to modify the key of a std::map or ? This example shows how to do so with rebalancing the tree. But what if I provide some guarantees that the key won't need to be rebalanced?