CodeQL library for C#
codeql/csharp-all 0.5.1 (changelog, source)
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Member predicate GuardedExpr::isGuardedBy

Holds if this expression is guarded by expression cond, which must evaluate to b. The expression sub is a sub expression of cond that is structurally equal to this expression.

In case this expression or sub accesses an SSA variable in its left-most qualifier, then so must the other (accessing the same SSA variable).

predicate isGuardedBy(Expr cond, Expr sub, boolean b)