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Merge pull request #8036 from andralex/ReplaceAll

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Improve ReplaceAll
This commit is contained in:
Razvan Nitu 2021-08-30 21:19:41 +08:00 • committed by GitHub
commit e67d040bc9
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1 changed files with 11 additions and 47 deletions
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58
std/meta.d
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@ -511,30 +511,19 @@ if (args.length >= 2)
}
/**
* Returns an `AliasSeq` created from TList with all occurrences
* of T, if found, replaced with U.
* Returns an `AliasSeq` created from `args[2 .. $]` with all occurrences
* of `args[0]`, if any, replaced with `args[1]`.
*/
template ReplaceAll(T, U, TList...)
template ReplaceAll(args...)
{
alias ReplaceAll = GenericReplaceAll!(T, U, TList).result;
}
/// Ditto
template ReplaceAll(alias T, U, TList...)
{
alias ReplaceAll = GenericReplaceAll!(T, U, TList).result;
}
/// Ditto
template ReplaceAll(T, alias U, TList...)
{
alias ReplaceAll = GenericReplaceAll!(T, U, TList).result;
}
/// Ditto
template ReplaceAll(alias T, alias U, TList...)
{
alias ReplaceAll = GenericReplaceAll!(T, U, TList).result;
alias ReplaceAll = AliasSeq!();
static foreach (arg; args[2 .. $])
{
static if (isSame!(args[0], arg))
ReplaceAll = AliasSeq!(ReplaceAll, args[1]);
else
ReplaceAll = AliasSeq!(ReplaceAll, arg);
}
}
///
@ -546,31 +535,6 @@ template ReplaceAll(alias T, alias U, TList...)
static assert(is(TL == AliasSeq!(int, char, char, int, float)));
}
// [internal]
private template GenericReplaceAll(args...)
if (args.length >= 2)
{
alias from = OldAlias!(args[0]);
alias to = OldAlias!(args[1]);
alias tuple = args[2 .. $];
static if (tuple.length)
{
alias head = OldAlias!(tuple[0]);
alias tail = tuple[1 .. $];
alias next = GenericReplaceAll!(from, to, tail).result;
static if (isSame!(from, head))
alias result = AliasSeq!(to, next);
else
alias result = AliasSeq!(head, next);
}
else
{
alias result = AliasSeq!();
}
}
@safe unittest
{
static assert(Pack!(ReplaceAll!(byte, ubyte,