Despite its name, in the C++ language standards this terminology is used to categorize expressions, not values.

Assignment: l-values and r-values

Some languages use the idea of l-values and r-values, deriving from the typical mode of evaluation on the left and right-hand side of an assignment statement. An l-value refers to an object that persists beyond a single expression. An r-value is a temporary value that does not persist beyond the expression that uses it.

The notion of l-values and r-values was

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