What is the difference between equivalence and equality in C++?
There is a very similar question here. However, this question is tagged with math, while I am interested in the meaning in C++ context.
To see the terms in context: Scott Meyers uses them in an example in this video.
On cppreference.com i found the following quote:
For the types that are both EqualityComparable and LessThanComparable, the C++ standard library makes a distinction between equality, which is the value of the expression a == b and equivalence, which is the value of the expression !(a < b) && !(b < a).
来源：https://stackoverflow.com/questions/31974941/what-is-the-difference-between-equivalence-and-equality