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)
cent adds(cent x, cent y, bool overflow)
nothrow @safe @nogc pure pragma(inline, true)
static if(is(cent))
cent
adds
()
(
cent x
,
cent y
,
ref bool overflow
)

Parameters

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

Return Value

Type: cent

the sum

Examples

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

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

adds

Parameters

Return Value

Examples

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