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Function core.checkedint.muls
Multiply two signed integers, checking for overflow.
int muls
(
int x,
int y,
ref bool overflow
);
long muls
(
long x,
long y,
ref bool overflow
);
The overflow is sticky, meaning a sequence of operations can be done and overflow need only be checked at the end.
Parameters
Name | Description |
---|---|
x | left operand |
y | right operand |
overflow | set if an overflow occurs, is not affected otherwise |
Returns
the product
Example
bool overflow;
writeln(muls(2, 3, overflow)); // 6
assert(!overflow);
writeln(muls(-200, 300, overflow)); // -60_000
assert(!overflow);
writeln(muls(1, int .max, overflow)); // int.max
assert(!overflow);
writeln(muls(int .min, 1, overflow)); // int.min
assert(!overflow);
writeln(muls(int .max, 2, overflow)); // (int.max * 2)
assert(overflow);
overflow = false;
writeln(muls(int .min, -1, overflow)); // int.min
assert(overflow);
writeln(muls(0, 0, overflow)); // 0
assert(overflow); // sticky
Example
bool overflow;
writeln(muls(2L, 3L, overflow)); // 6
assert(!overflow);
writeln(muls(-200L, 300L, overflow)); // -60_000
assert(!overflow);
writeln(muls(1, long .max, overflow)); // long.max
assert(!overflow);
writeln(muls(long .min, 1L, overflow)); // long.min
assert(!overflow);
writeln(muls(long .max, 2L, overflow)); // (long.max * 2)
assert(overflow);
overflow = false;
writeln(muls(-1L, long .min, overflow)); // long.min
assert(overflow);
overflow = false;
writeln(muls(long .min, -1L, overflow)); // long.min
assert(overflow);
writeln(muls(0L, 0L, overflow)); // 0
assert(overflow); // sticky
Authors
Walter Bright
License
Copyright © 1999-2024 by the D Language Foundation | Page generated by ddox.