On Friday, 19 July 2013 at 17:18:00 UTC, JS wrote:
I'm trying to create a split function that can handle both char
and string delims. I initially created two separate functions
but this doesn't work for default parameters since the compiler
doesn't know which one to choose(but in this case both would
work fine and it would be nice to inform the compiler of that).
Simply provide a default parameter for *one* of the functions. EG:
string[] split(string s, char d = ' ');
string[] split(string s, string d);
This lifts the ambiguity. If *both* have default params, then the
ambiguity is simply not solvable, even by a human being.
Another solution is the "no default multiple sig" option, eg:
string[] split(string s)
{
return split(s, ' ');
}
string[] split(string s, char d);
string[] split(string s, string d);
PS: Are you doing this to learn? std.array.split does the same
thing for you.
I then tried to template and conditionally code the two but it
still doesn't work:
both functions work separately but when i uncomment the string
version I get an error about the string version shadowing.
import std.stdio, std.cstream;
string[] split(T)(string s, T d) if (is(T == char) || is(T ==
string))
{
int i = 0, oldj = 0; bool ok = true;
string[] r;
foreach(j, c; s)
{
static if (is(T == char))
{
if (c == d)
{
if (!ok) { oldj++; continue; }
if (r.length <= i) r.length += 5;
r[i] = s[oldj..j];
i++; oldj = j+1;
ok = false;
} else if (!ok) ok = true;
}
else if (is(T == string))
{
/*
for(int j = 0; j < s.length - d.length; j++)
{
if (s[j..j + d.length] == d)
{
if (!ok) { oldj++; continue; }
if (i == r.length) r.length += 5;
r[i] = s[oldj..j - d.length + 1];
i++; oldj = j + d.length;
ok = false;
} else if (!ok) ok = true;
}
*/
}
}
if (oldj < s.length)
{
if (r.length <= i) r.length++;
r[i] = s[oldj..$];
i++;
}
r.length = i;
return r;
}
string[] splitS(string s, string d = " ")
{
int i = 0, oldj = 0; bool ok = true;
string[] r;
for(int j = 0; j < s.length - d.length; j++)
{
if (s[j..j + d.length] == d)
{
if (!ok) { oldj++; continue; }
if (r.length <= i) r.length += 5;
r[i] = s[oldj..j - d.length + 1];
i++; oldj = j + d.length;
ok = false;
} else if (!ok) ok = true;
}
if (oldj < s.length)
{
if (r.length <= i) r.length++;
r[i] = s[oldj..$];
i++;
}
r.length = i;
return r;
}
void main(string[] args)
{
auto s = splitS("abc bas ccc", " ");
foreach(a; s) writeln(a);
din.getc();
}
