Since this is the top Google result on Stack Overflow for C++ unordered_set of objects I’ll post a simple yet completely illustrative and copy/paste runnable example: // UnorderedSetOfObjects.cpp #include <iostream> #include <vector> #include <unordered_set> struct Point { int x; int y; Point() { } Point(int x, int y) { this->x = x; this->y = y; … Read more
TLDR; from 2005 up to 2018/Git 2.18: SHA-1 (see below) 2019, will switch at some point to SHA-256 You can check that from Linus Torvalds himself, when he presented Git to Google back in 2007: (emphasis mine) We check checksums that is considered cryptographically secure. Nobody has been able to break SHA-1, but the point … Read more
MD5 processes an arbitrary-length message into a fixed-length output of 128 bits, typically represented as a sequence of 32 hexadecimal digits.
A hashmap works like this (this is a little bit simplified, but it illustrates the basic mechanism): It has a number of “buckets” which it uses to store key-value pairs in. Each bucket has a unique number – that’s what identifies the bucket. When you put a key-value pair into the map, the hashmap will … Read more