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Function std.experimental.checkedint.Throw.hookOpCmp

Called automatically upon a comparison for ordering using one of the operators <, <=, >, or >=. In case the comparison is erroneous (i.e. it would make a signed negative value appear greater than or equal to an unsigned positive value), throws a Throw.CheckFailure exception. Otherwise, the three-state result is returned (positive if lhs > rhs, negative if lhs < rhs, 0 otherwise).

int hookOpCmp(Lhs, Rhs) (
  Lhs lhs,
  Rhs rhs
);

Parameters

NameDescription
lhs The first argument of Checked, e.g. int if the left-hand side of the operator is Checked!int
rhs The right-hand side type involved in the operator

Returns

For correct comparisons, returns a positive integer if lhs > rhs, a negative integer if lhs < rhs, 0 if the two are equal.

Throws

Upon a mistaken comparison such as int(-1) < uint(0), the function never returns because it throws a Throw.CheckedFailure exception.

Authors

License