David Abrahams wrote:
"Peter Dimov" <pdimov@mmltd.net> writes:
David Abrahams wrote:
Is it really true that I can write
bind(f, _1) > _2
but can't write
_1 > _2
??
I can't imagine a good reason for that restriction, but I don't see any indication that the latter is supported in the docs.
A limitation of the current implementation. On some compilers, the placeholders are function pointers and _1 > _2 can't be overloaded. There's no other technical reason that prevents _1 > _2 (or _1 > 0) from working; it'd fall out of the specification.
Thanks for the info.
What abut the trick of making the placeholders references in an unnamed namespace to objects in a named one?
The problem is that on some compilers we can't define objects in precompiled headers. This is not an issue for TR1 because the placeholders are only declared 'extern' in the header, only for the Boost implementation ("least common denominator" for historical reasons :-)