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Function std.experimental.checkedint.Warn.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), then a warning message is printed to stderr.

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

In all cases, returns lhs < rhs ? -1 : lhs > rhs. The result is not autocorrected in case of an erroneous comparison.

Example

auto x = checked!Warn(-42);
// Passes
assert(x <= -42);
// Passes but prints a warning
// assert(x <= uint(-42));

Authors

License