[Feature Request] Extension methods C# like

[TheByKotik]

If you know about extension methods in C#, you know is good layer of abstraction.
As example SourceMod have this function:

/**
 * Converts an integer to a string.
 *
 * @param num           Integer to convert.
 * @param str           Buffer to store string in.
 * @param maxlength     Maximum length of string buffer.
 * @return              Number of cells written to buffer.
 */
native int IntToString(int num, char[] str, int maxlength);

But this can be simplify to:

// Syntax below is not real syntax, just example how it may look

// int.inc
native int ToString (char[] szBuffer, const int iSize, const int iBase = 10) extend int;

// plugin.sp
char[32] buffer;

1300.ToString( buffer, sizeof buffer );

int i = 7777;
i.ToString( buffer, sizeof buffer, 2 );

[dvander]

I like this feature in C# and I think it's some clever syntactic sugar. But we're not ready for this in spcomp. Even in the fancy new compiler, it's fundamentally based on tagged cells, and still has no formal notion of types. That makes it harder to implement features like this, and I don't want to add too many kludges around name lookups.

Source-only plugins is probably a blocker for this, but certainly it's a 1.12 feature either way.