Value Categories in C++17

  • A glvalue is an expression whose evaluation determines the identity of an object, bit-field, or function.
  • A prvalue is an expression whose evaluation initializes an object or a bit-field, or computes the value of the operand of an operator, as specified by the context in which it appears.
  • An xvalue is a glvalue that denotes an object or bit-field whose resources can be reused (usually because it is near the end of its lifetime).

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Barry Revzin

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