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Implement operations on negative numbers

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This commit is contained in:
Eugen Wissner 2016-12-06 23:22:12 +01:00
parent fa607141e4
commit f75433e0e6
1 changed files with 94 additions and 24 deletions
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118
source/tanya/math/mp.d
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@ -53,8 +53,7 @@ struct Integer
assignInt(absolute);
}
///
unittest
private unittest
{
{
auto h = Integer(79);
@ -178,8 +177,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
auto h = Integer(1019);
assert(h.length == 2);
@ -216,8 +214,7 @@ struct Integer
return rep == h.rep;
}
///
unittest
private unittest
{
auto h1 = Integer(1019);
@ -262,8 +259,7 @@ struct Integer
return 0;
}
///
unittest
private unittest
{
auto h1 = Integer(1019);
auto h2 = Integer(1019);
@ -380,11 +376,45 @@ struct Integer
checkAllocator();
static if (op == "+")
{
add(h.rep);
if (h.sign == sign)
{
add(h.rep);
}
else
{
if (this >= h)
{
subtract(h.rep);
}
else
{
auto tmp = Integer(h);
tmp.subtract(rep);
rep = tmp.rep;
sign = length == 0 ? false : h.sign;
}
}
}
else
{
subtract(h.rep);
if (h.sign == sign)
{
if (this >= h)
{
subtract(h.rep);
}
else
{
auto tmp = Integer(h);
tmp.subtract(rep);
rep = tmp.rep;
sign = length == 0 ? false : !sign;
}
}
else
{
subtract(h.rep);
}
}
return this;
}
@ -403,6 +433,12 @@ struct Integer
h1 += h2;
assert(h1.rep == [0x01, 0x00, 0x00, 0x11, 0x02]);
h1 = 3;
h2 = 4;
h1 -= h2;
assert(h1.rep == [0x01]);
assert(h1.sign);
}
private unittest
@ -460,8 +496,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
auto h1 = Integer(4294967295);
h1 <<= 1;
@ -504,8 +539,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
auto h1 = Integer(4294967294);
h1 >>= 10;
@ -563,8 +597,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
auto h1 = Integer(123);
auto h2 = Integer(456);
@ -629,8 +662,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
auto h1 = Integer(18);
auto h2 = Integer(4);
@ -680,8 +712,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
auto h1 = Integer(2);
auto h2 = Integer(4);
@ -717,8 +748,7 @@ struct Integer
return h;
}
///
unittest
private unittest
{
auto h1 = Integer(79);
Integer h2;
@ -822,8 +852,7 @@ struct Integer
return this;
}
///
unittest
private unittest
{
Integer h;
@ -867,4 +896,45 @@ struct Integer
allocator = defaultAllocator;
}
}
/**
* Casting to boolean.
*
* Returns: $(D_KEYWORD false) if the $(D_PSYMBOL Integer) is 0,
* $(D_KEYWORD true) otherwise.
*/
T opCast(T : bool)() const pure nothrow @safe @nogc
{
return length == 0 ? false : true;
}
/**
* Casting to integer types.
*
* Returns: Integer type.
*/
T opCast(T : long)() const// pure nothrow @safe @nogc
{
ulong ret;
for (size_t i = length, j; i > 0 && j <= 32; --i, j += 8)
{
ret |= cast(long) (rep[i - 1]) << j;
}
return sign ? -ret : ret;
}
private unittest
{
auto h = Integer(79);
assert(cast(long) h == 79);
h = -79;
assert(cast(long) h == -79);
h = 4294967295;
assert(cast(long) h == 4294967295);
h = -4294967295;
assert(cast(long) h == -4294967295);
}
}