Subject: [Boost-bugs] [Boost C++ Libraries] #2246: Phoenix2 lazy function compilation error
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-08-22 16:05:27
#2246: Phoenix2 lazy function compilation error
--------------------------------------------------+-------------------------
Reporter: François Barel <frabar666_at_[hidden]> | Owner: djowel
Type: Bugs | Status: new
Milestone: Boost 1.37.0 | Component: spirit
Version: Boost 1.36.0 | Severity: Problem
Keywords: phoenix lazy function |
--------------------------------------------------+-------------------------
I get a compilation error when trying to do a lazy Phoenix function.
By that I mean a Phoenix function (for use in a Spirit action) which is in
fact the result of calling another Phoenix actor (in my case a
phoenix::bind) -- as the implementation of {{{function}}}, {{{compose}}}
and {{{function_eval}}} seems to allow (IIUC the function can be any
Phoenix actor, just like its arguments).
[[BR]]
Repro:
{{{
#include <boost/spirit/include/qi.hpp>
using namespace ::boost::spirit;
using namespace ::boost::spirit::qi;
#include <boost/spirit/include/phoenix_bind.hpp>
#include <boost/spirit/include/phoenix_function.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
using namespace ::boost::phoenix;
template< typename F >
function< F > make_function(const F& f)
{ return function< F >(f); }
struct Actor
{
typedef void result_type;
template< typename T = unused_type >
struct result { typedef result_type type; };
void operator()(int) const { assert( this != NULL ); }
};
struct Context
{
const Actor* pa;
};
int main()
{
Context c = { NULL };
Actor a;
rule< const wchar_t* > r;
// Not lazy, fine.
r = eps[ make_function( a )(42) ];
// Lazy, compilation error.
r = eps[ make_function( *bind( &Context::pa, c ) )(42) ];
c.pa = &a;
const wchar_t* x = L"";
parse(x, x, r);
return 0;
}
}}}
The error is (note the '{{{&}}}'):
{{{
boost/spirit/home/phoenix/core/detail/function_eval.hpp:108:
error: âconst Actor&â is not a class, struct, or union type
}}}
[[BR]]
The attached patch ({{{remove_reference}}} when getting function type)
solved it for me.
Francois
-- Ticket URL: <http://svn.boost.org/trac/boost/ticket/2246> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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