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Merge pull request #8736 from FeepingCreature/fix/issue-23844-immutable-chain

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Fix issue 23844: Support ranges with immutable fields (like `only` with `immutable struct`) in `chain`.
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Dennis 2023-05-10 11:54:08 +02:00 • committed by GitHub
commit cf97c75385
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1 changed files with 40 additions and 11 deletions
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51
std/range/package.d
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@ -232,7 +232,7 @@ module std.range;
public import std.array;
public import std.range.interfaces;
public import std.range.primitives;
public import std.typecons : Flag, Yes, No;
public import std.typecons : Flag, Yes, No, Rebindable, rebindable;
import std.internal.attributes : betterC;
import std.meta : aliasSeqOf, allSatisfy, anySatisfy, staticMap;
@ -978,6 +978,11 @@ if (Ranges.length > 0 &&
static if (bidirectional) size_t backIndex;
else enum backIndex = source.length;
this(typeof(this.tupleof) fields)
{
this.tupleof = fields;
}
public:
this(R input)
{
@ -1376,25 +1381,34 @@ if (Ranges.length > 0 &&
static if (allSatisfy!(hasLength, R) && allSatisfy!(hasSlicing, R))
auto opSlice(size_t begin, size_t end) return scope
{
auto result = this;
// force staticMap type conversion to Rebindable
static struct ResultRanges
{
staticMap!(Rebindable, Ranges) fields;
}
auto sourceI(size_t i)() => rebindable(this.source[i]);
auto resultRanges = ResultRanges(staticMap!(sourceI, aliasSeqOf!(R.length.iota))).fields;
size_t resultFrontIndex = this.frontIndex;
static if (bidirectional)
size_t resultBackIndex = this.backIndex;
sw: switch (frontIndex)
{
static foreach (i; 0 .. R.length)
{
case i:
immutable len = result.source[i].length;
immutable len = resultRanges[i].length;
if (len <= begin)
{
result.source[i] = result.source[i]
resultRanges[i] = resultRanges[i]
[len .. len];
begin -= len;
result.frontIndex++;
resultFrontIndex++;
goto case;
}
else
{
result.source[i] = result.source[i]
resultRanges[i] = resultRanges[i]
[begin .. len];
break sw;
}
@ -1418,18 +1432,18 @@ if (Ranges.length > 0 &&
static foreach_reverse (i; 1 .. R.length + 1)
{
case i:
immutable len = result.source[i-1].length;
immutable len = resultRanges[i-1].length;
if (len <= cut)
{
result.source[i-1] = result.source[i-1]
resultRanges[i-1] = resultRanges[i-1]
[0 .. 0];
cut -= len;
result.backIndex--;
resultBackIndex--;
goto case;
}
else
{
result.source[i-1] = result.source[i-1]
resultRanges[i-1] = resultRanges[i-1]
[0 .. len - cut];
break sw2;
}
@ -1445,7 +1459,10 @@ if (Ranges.length > 0 &&
assert(0, "Internal library error. Please report it.");
}
return result;
static if (bidirectional)
return Result(resultRanges, resultFrontIndex, resultBackIndex);
else
return Result(resultRanges, resultFrontIndex);
}
}
return Result(rs);
@ -1643,6 +1660,18 @@ pure @safe unittest
assert(equal(r, "foobar"));
}
// https://issues.dlang.org/show_bug.cgi?id=23844
pure @safe unittest
{
struct S
{
immutable int value;
}
auto range = chain(only(S(5)), only(S(6)));
assert(range.array == [S(5), S(6)]);
}
pure @safe nothrow @nogc unittest
{
// support non-copyable items