CodeQL library for C/C++
codeql/cpp-all 0.12.8-dev (changelog, source)
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Member predicate Expr::isXValueCategory

Holds if this expression is an xvalue. An xvalue is a location whose lifetime is about to end (e.g. an rvalue reference returned from a function call). See [basic.lval] for more about xvalues.

predicate isXValueCategory()