adds

Add two signed integers, checking for overflow.

The overflow is sticky, meaning a sequence of operations can be done and overflow need only be checked at the end.

int adds(int x, int y, bool overflow)
long adds(long x, long y, bool overflow)
nothrow @safe @nogc pure pragma(inline, true)
long
adds
()
(
long x
,
long y
,
ref bool overflow
)
cent adds(cent x, cent y, bool overflow)

Parameters

x long: left operand
y long: right operand
overflow bool: set if an overflow occurs, is not affected otherwise

Return Value

Type: long

the sum

Examples

bool overflow;
assert(adds(2L, 3L, overflow) == 5);
assert(!overflow);

assert(adds(1L, long.max - 1, overflow) == long.max);
assert(!overflow);

assert(adds(long.min + 1, -1, overflow) == long.min);
assert(!overflow);

assert(adds(long.max, 1, overflow) == long.min);
assert(overflow);

overflow = false;
assert(adds(long.min, -1, overflow) == long.max);
assert(overflow);

assert(adds(0L, 0L, overflow) == 0);
assert(overflow);                   // sticky

bool overflow;
assert(adds(2, 3, overflow) == 5);
assert(!overflow);

assert(adds(1, int.max - 1, overflow) == int.max);
assert(!overflow);

assert(adds(int.min + 1, -1, overflow) == int.min);
assert(!overflow);

assert(adds(int.max, 1, overflow) == int.min);
assert(overflow);

overflow = false;
assert(adds(int.min, -1, overflow) == int.max);
assert(overflow);

assert(adds(0, 0, overflow) == 0);
assert(overflow);                   // sticky

adds

Parameters

Return Value

Examples

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