• Sean Kelly <sean f4.ca> Jul 24 2004
• Nick <Nick_member pathlink.com> Jul 24 2004

Sean Kelly <sean f4.ca> writes:

I think it's a tad odd that this compiles:

# class Writer
# {
#     abstract void put (bit x){ printf( "bit\n" ); }
#     abstract void put (int x){ printf( "int\n" ); }
# }
# 
# class MyWriter : Writer
# {
#     override void put (bit x){}
# }

I had assumed that thhis was the equivalent of the C++ code:

# class Writer
# {
#     virtual void put (bit x) = 0 { printf( "bit\n" ); }
#     abstract void put (int x) = 0 { printf( "int\n" ); }
# }
# 
# class MyWriter : Writer
# {
#     virutal void put (bit x){}
# }

ie. that it forced the user to implement the functions and the bodies were
provided as defaults.

Sean

Nick <Nick_member pathlink.com> writes:

In article <cducnr$1731$1 digitaldaemon.com>, Sean Kelly says...
I think it's a tad odd that this compiles:

# class Writer
# {
#     abstract void put (bit x){ printf( "bit\n" ); }
#     abstract void put (int x){ printf( "int\n" ); }
# }
# 
# class MyWriter : Writer
# {
#     override void put (bit x){}
# }
[snip]


Well, considering that the following just compiled and ran:

# import std.stdio;
#
# class Writer
# {
#   abstract void put(int x) {writefln("int: ", x);}
# }
#
# void main()
# {
#   Writer w = new Writer;
#   w.put(7);
# }

I'd say it looks like the 'abstract' attribute is completely ignored when you
specify a function body. The docs are painfully low on details about the
'abstract' attribute, so I'm not really sure if this classifies as a bug :)

Nick