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Function std.checkedint.Saturate.onOverflow

Implements saturation for operators +, - (unary and binary), *, /, %, ^^, &, |, ^, <<, >>, and >>>.

auto onOverflow(string x, Lhs) (
  Lhs
);

typeof(Lhs()+Rhs()) onOverflow(string x, Lhs, Rhs) (
  Lhs lhs,
  Rhs rhs
);

For unary -, onOverflow is called if lhs == Lhs.min and Lhs is a signed type. The function returns Lhs.max.

For binary operators, the result is as follows:

  • Lhs.max if the result overflows in the positive direction, on division by 0, or on shifting right by a negative value
  • Lhs.min if the result overflows in the negative direction
  • 0 if lhs is being shifted left by a negative value, or shifted right by a large positive value

Parameters

NameDescription
x The operator involved in the opAssign operation
Lhs The left-hand side type of the operator (Lhs is the first argument to Checked)
Rhs The right-hand side type in the operator

Returns

The saturated result of the operator.

Example

writeln(checked!Saturate(int.max) + 1); // int.max
writeln(checked!Saturate(100)^^10); // int.max
writeln(checked!Saturate(-100)^^10); // int.max
writeln(checked!Saturate(100) / 0); // int.max
writeln(checked!Saturate(100) << -1); // 0
writeln(checked!Saturate(100) << 33); // int.max
writeln(checked!Saturate(100) >> -1); // int.max
writeln(checked!Saturate(100) >> 33); // 0
}

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