The algorithms library defines functions for a variety of purposes (e.g. searching, sorting, counting, manipulating) that operate on ranges of elements. Note that a range is defined as [first, last) where last refers to the element past the last element to inspect or modify.
If the algorithm fails to allocate memory, std::bad_alloc is thrown. Possible implementation See also the implementations in libstdc++ and libc++. Notes Before LWG713, the complexity requirement allowed sort() to be implemented using only Quicksort, which may need O (N2 ) comparisons in the worst case.
C++20 provides constrained versions of most algorithms in the namespace std::ranges. In these algorithms, a range can be specified as either an iterator - sentinel pair or as a single range argument, and projections and pointer-to-member callables are supported. Additionally, the return types of most algorithms have been changed to return all potentially useful information computed during the ...
Exceptions The overloads with a template parameter named ExecutionPolicy report errors as follows: If execution of a function invoked as part of the algorithm throws an exception and ExecutionPolicy is one of the standard policies, std::terminate is called. For any other ExecutionPolicy, the behavior is implementation-defined. If the algorithm fails to allocate memory, std::bad_alloc is thrown ...
For any other ExecutionPolicy, the behavior is implementation-defined. If the algorithm fails to allocate memory, std::bad_alloc is thrown. Notes std::reduce behaves like std::accumulate except the elements of the range may be grouped and rearranged in arbitrary order. Example Side-by-side comparison between std::reduce and std::accumulate: