On 1/15/2011 5:13 PM, Denis Shevchenko wrote:
And more... Single standard of namespaces would resolve the problem with placeholders. When I write:
_1
what is it? Is it boost::lambda, boost::bind or boost::spirit::qi? IMHO, each placeholder must be placed in own namespace.
You forgot boost::mpl, which is also has the numeric placeholders. For some ( if not all ) of those libraries the placeholders are in their own namespace. But either the names are lifted into the global namespace for ease of use or the end-user puts it there. Of course ideally the authors should not be putting their placeholders into the global namespace, but let the end-user do that if he wants. The library authors are aware of this issue, but changing now will break much code so that is probably the reason why changes have not been made.