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Function std.checkedint.WithNaN.hookOpOpAssign

Defines hooks for binary operators +=, -=, *=, /=, %=, ^^=, &=, |=, ^=, <<=, >>=, and >>>= for cases where a Checked object is the left-hand side operand. If lhs == WithNaN.defaultValue!Lhs, no action is carried. Otherwise, evaluates the operand. If evaluation does not overflow and fits in Lhs without loss of information or change of sign, sets lhs to the result. Otherwise, sets lhs to WithNaN.defaultValue!Lhs.

void hookOpOpAssign(string x, L, R) (
  ref L lhs,
  R rhs
);

Parameters

NameDescription
x The operator symbol (without the =)
lhs The left-hand side operand (Lhs is the first argument to Checked)
rhs The right-hand side operand

Returns

void

Example

Checked!(int, WithNaN) x;
x += 4;
assert(x.isNaN);
x = 0;
x += 4;
assert(!x.isNaN);
x += int.max;
assert(x.isNaN);
}

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