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What is the meaning of 1 after IEnumerable in: System.Collections.Generic.IEnumerable`1
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The bitwise OR assignment operator ( |= ) uses the binary representation of both operands, does a bitwise OR operation on them and assigns the result to the variable.
The ~ operator in C++ (and other C-like languages like C and Java) performs a bitwise NOT operation - all the 1 bits in the operand are set to 0 and all the 0 bits in the operand are set to 1. In other words, it creates the complement of the original number.
It is the generic arity of the type, or put another way, the number of type parameters a generic type supports. IEnumerable<T> supports a single type parameter. If you were to look at Dictionary<TKey, TValue> you would notice an arity value of 2.
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