Add String.remove

This commit is contained in:
Eugen Wissner 2017-05-12 20:23:16 +02:00
parent 8477312769
commit d4ab339feb

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@ -1357,5 +1357,53 @@ struct String
return opSliceAssign(value, 0, length);
}
/**
* Remove all characters beloning to $(D_PARAM r).
*
* Params:
* r = Range originally obtained from this string.
*
* Returns: A range spanning the remaining characters in the string that
* initially were right after $(D_PARAM r).
*
* Precondition: $(D_PARAM r) refers to a region of $(D_KEYWORD this).
*/
R remove(R)(R r) pure nothrow @trusted @nogc
if (is(R == ByCodeUnit!char) || is(R == ByCodePoint!char))
in
{
assert(r.container is &this);
assert(r.begin >= this.data);
assert(r.end <= this.data + length);
}
body
{
auto end = this.data + this.length;
copy(ByCodeUnit!char(this, r.end, end), ByCodeUnit!char(this, r.begin, end));
this.length_ = length - (r.end - r.begin);
return R(this, r.begin, this.data + length);
}
///
@nogc @safe unittest
{
auto s = String("Из пословицы слова не выкинешь");
assert(s.remove(s[5 .. 24]).length == 32);
assert(s == "Из слова не выкинешь");
assert(s.length == 37);
auto byCodePoint = s.byCodePoint();
byCodePoint.popFrontN(8);
assert(s.remove(byCodePoint).count == 0);
assert(s == "Из слова");
assert(s.remove(s[]).length == 0);
assert(s.length == 0);
assert(s.remove(s[]).length == 0);
}
mixin DefaultAllocator;
}