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Added auto-decoding special case to std.algorithm.comparison.equal

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This commit is contained in:
Jack Stouffer 2016-06-02 12:06:55 -04:00
parent b284e965fe
commit cb073a2cc9
1 changed files with 33 additions and 0 deletions
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33
std/algorithm/comparison.d
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@ -736,6 +736,27 @@ template equal(alias pred = "a == b")
{
return r1 == r2;
}
// if one of the arguments is a string and the other isn't, then auto-decoding
// can be avoided if they have the same ElementEncodingType
else static if (is(typeof(pred) == string) && pred == "a == b" &&
isAutodecodableString!Range1 != isAutodecodableString!Range2 &&
is(ElementEncodingType!Range1 == ElementEncodingType!Range2))
{
import std.utf : byCodeUnit;
static if (isAutodecodableString!Range1)
{
auto codeUnits = r1.byCodeUnit;
alias other = r2;
}
else
{
auto codeUnits = r2.byCodeUnit;
alias other = r1;
}
return equal(codeUnits, other);
}
//Try a fast implementation when the ranges have comparable lengths
else static if (hasLength!Range1 && hasLength!Range2 && is(typeof(r1.length == r2.length)))
{
@ -863,6 +884,18 @@ range of range (of range...) comparisons.
assert(!equal(a, ifr));
}
@safe pure unittest
{
import std.utf : byChar, byWchar, byDchar;
assert(equal("æøå".byChar, "æøå"));
assert(equal("æøå", "æøå".byChar));
assert(equal("æøå".byWchar, "æøå"w));
assert(equal("æøå"w, "æøå".byWchar));
assert(equal("æøå".byDchar, "æøå"d));
assert(equal("æøå"d, "æøå".byDchar));
}
// MaxType
private template MaxType(T...)
if (T.length >= 1)