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An n-ary Polymorphic Function Object adapter template for an unary Polymorphic Function Object target function. When called, its arguments are bundled to a Random Access Sequence of references that is passed to the target function object. All referenced objects in the sequence are const qualified.
The overload set of the adapter's function call operator can be restricted
by removing the type
member
from the nested result metafunction of the Polymorphic
Function Object (in this case the substitution-failure-is-not-an-error
principle applies for non-nullary calls and nullary calls are explicitly
disabled by the library).
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Caution |
---|---|
As the nullary call operator cannot be a template it will be instantiated along with the class template, so it must be disabled (as described above) in cases where it isn't instantiable. |
The type of the target function is allowed to be const qualified or a reference.
Const qualification is preserved and propagated appropriately (in other
words, only const versions of operator()
can be used
if the target function object is const - or, in case the target function
object is held by value, the adapter is const).
#include <boost/fusion/functional/adapter/unfused_rvalue_args.hpp>
template <class Function> class unfused_rvalue_args;
Parameter | Description | Default |
---|---|---|
Function |
A unary Polymorphic Function Object |
Notation
F
f
F
UR
unfused_rvalue_args<F>
ur
UR
, initialized
with f
a0
...aN
ur
Expression | Semantics |
---|---|
UR(f) |
Creates
a fused function as described above, initializes the target function
with f . |
UR() |
Creates
a fused function as described above, attempts to use F 's default constructor. |
ur(a0 ...aN)
|
Calls f with a Sequence
that contains references to the arguments a0 ...aN . |
struct sequence_printer { template <class Seq> struct result { typedef void type; }; template <class Seq> void operator()(Seq const & s) const { std::cout << s << std::endl; } }; void try_it() { unfused_rvalue_args<sequence_printer> print; print(24,"bottles of beer in",'a',"box."); }
Copyright © 2001-2005 Joel de Guzman, Dan Marsden |