// Boost.Function library
-// Copyright (C) 2001-2003 Doug Gregor (gregod@cs.rpi.edu)
-//
-// Permission to copy, use, sell and distribute this software is granted
-// provided this copyright notice appears in all copies.
-// Permission to modify the code and to distribute modified code is granted
-// provided this copyright notice appears in all copies, and a notice
-// that the code was modified is included with the copyright notice.
-//
-// This software is provided "as is" without express or implied warranty,
-// and with no claim as to its suitability for any purpose.
+// Copyright Douglas Gregor 2001-2006
+// Copyright Emil Dotchevski 2007
+// Use, modification and distribution is subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#include <string>
#include <memory>
#include <new>
+#include <typeinfo>
#include <boost/config.hpp>
#include <boost/assert.hpp>
-#include <boost/type_traits/arithmetic_traits.hpp>
+#include <boost/type_traits/is_integral.hpp>
#include <boost/type_traits/composite_traits.hpp>
-#include <boost/type_traits/is_stateless.hpp>
#include <boost/ref.hpp>
-#include <boost/pending/ct_if.hpp>
+#include <boost/mpl/if.hpp>
#include <boost/detail/workaround.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+#ifndef BOOST_NO_SFINAE
+# include "boost/utility/enable_if.hpp"
+#else
+# include "boost/mpl/bool.hpp"
+#endif
+#include <boost/function_equal.hpp>
+
+#if defined(BOOST_MSVC)
+# pragma warning( push )
+# pragma warning( disable : 4793 ) // complaint about native code generation
+# pragma warning( disable : 4127 ) // "conditional expression is constant"
+#endif
+
+// Define BOOST_FUNCTION_STD_NS to the namespace that contains type_info.
+#ifdef BOOST_NO_EXCEPTION_STD_NAMESPACE
+// Embedded VC++ does not have type_info in namespace std
+# define BOOST_FUNCTION_STD_NS
+#else
+# define BOOST_FUNCTION_STD_NS std
+#endif
+
+// Borrowed from Boost.Python library: determines the cases where we
+// need to use std::type_info::name to compare instead of operator==.
+# if (defined(__GNUC__) && __GNUC__ >= 3) \
+ || defined(_AIX) \
+ || ( defined(__sgi) && defined(__host_mips))
+# include <cstring>
+# define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) \
+ (std::strcmp((X).name(),(Y).name()) == 0)
+# else
+# define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) ((X)==(Y))
+#endif
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__ICL) && __ICL <= 600 || defined(__MWERKS__) && __MWERKS__ < 0x2406 && !defined(BOOST_STRICT_CONFIG)
# define BOOST_FUNCTION_TARGET_FIX(x) x
}}}
#endif
-// GCC 2.95.3 (or earlier) doesn't support enable_if
-#if BOOST_WORKAROUND(__GNUC__, < 3)
-# define BOOST_FUNCTION_NO_ENABLE_IF
-#endif
-
-// MIPSpro 7.3.1.3m doesn't support enable_if
-#if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730 && !defined(BOOST_STRICT_CONFIG)
-# define BOOST_FUNCTION_NO_ENABLE_IF
-#endif
-
-// MSVC 7.0 doesn't support enable_if
-#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300 && !defined(BOOST_STRICT_CONFIG)
-# define BOOST_FUNCTION_NO_ENABLE_IF
-#endif
-
-// Borland C++ 5.6.0 doesn't support enable_if
-#if BOOST_WORKAROUND(__BORLANDC__, <= 0x564)
-# define BOOST_FUNCTION_NO_ENABLE_IF
+#if defined (BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
+ || defined(BOOST_BCB_PARTIAL_SPECIALIZATION_BUG) \
+ || !(BOOST_STRICT_CONFIG || !defined(__SUNPRO_CC) || __SUNPRO_CC > 0x540)
+# define BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX
#endif
-// Metrowerks 7.2 doesn't support enable_if
-#if BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
-# define BOOST_FUNCTION_NO_ENABLE_IF
-#endif
-
-#if BOOST_WORKAROUND(__SUNPRO_CC, <= 0x540)
-# define BOOST_FUNCTION_NO_ENABLE_IF
+#if !BOOST_WORKAROUND(__BORLANDC__, < 0x600)
+# define BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor,Type) \
+ typename ::boost::enable_if_c<(::boost::type_traits::ice_not< \
+ (::boost::is_integral<Functor>::value)>::value), \
+ Type>::type
+#else
+// BCC doesn't recognize this depends on a template argument and complains
+// about the use of 'typename'
+# define BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor,Type) \
+ ::boost::enable_if_c<(::boost::type_traits::ice_not< \
+ (::boost::is_integral<Functor>::value)>::value), \
+ Type>::type
#endif
-#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+#if !defined(BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX)
namespace boost {
-#if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730 && !defined(BOOST_STRICT_CONFIG)
-// The library shipping with MIPSpro 7.3.1.3m has a broken allocator<void>
-class function_base;
-
-template<typename Signature,
- typename Allocator = std::allocator<function_base> >
-class function;
-#else
-template<typename Signature, typename Allocator = std::allocator<void> >
+template<typename Signature>
class function;
-#endif
-template<typename Signature, typename Allocator>
-inline void swap(function<Signature, Allocator>& f1,
- function<Signature, Allocator>& f2)
+template<typename Signature>
+inline void swap(function<Signature>& f1,
+ function<Signature>& f2)
{
f1.swap(f2);
}
namespace boost {
namespace detail {
namespace function {
+ class X;
+
/**
- * A union of a function pointer and a void pointer. This is necessary
- * because 5.2.10/6 allows reinterpret_cast<> to safely cast between
- * function pointer types and 5.2.9/10 allows static_cast<> to safely
- * cast between a void pointer and an object pointer. But it is not legal
- * to cast between a function pointer and a void* (in either direction),
- * so function requires a union of the two. */
- union any_pointer
+ * A buffer used to store small function objects in
+ * boost::function. It is a union containing function pointers,
+ * object pointers, and a structure that resembles a bound
+ * member function pointer.
+ */
+ union function_buffer
{
+ // For pointers to function objects
void* obj_ptr;
+
+ // For pointers to std::type_info objects
+ // (get_functor_type_tag, check_functor_type_tag).
const void* const_obj_ptr;
- void (*func_ptr)();
- char data[1];
- };
- inline any_pointer make_any_pointer(void* o)
- {
- any_pointer p;
- p.obj_ptr = o;
- return p;
- }
+ // For function pointers of all kinds
+ mutable void (*func_ptr)();
- inline any_pointer make_any_pointer(const void* o)
- {
- any_pointer p;
- p.const_obj_ptr = o;
- return p;
- }
+ // For bound member pointers
+ struct bound_memfunc_ptr_t {
+ void (X::*memfunc_ptr)(int);
+ void* obj_ptr;
+ } bound_memfunc_ptr;
- inline any_pointer make_any_pointer(void (*f)())
- {
- any_pointer p;
- p.func_ptr = f;
- return p;
- }
+ // To relax aliasing constraints
+ mutable char data;
+ };
/**
* The unusable class is a placeholder for unused function arguments
// The operation type to perform on the given functor/function pointer
enum functor_manager_operation_type {
clone_functor_tag,
- destroy_functor_tag
+ destroy_functor_tag,
+ check_functor_type_tag,
+ get_functor_type_tag
};
// Tags used to decide between different types of functions
struct function_obj_tag {};
struct member_ptr_tag {};
struct function_obj_ref_tag {};
- struct stateless_function_obj_tag {};
template<typename F>
class get_function_tag
{
- typedef typename ct_if<(is_pointer<F>::value),
- function_ptr_tag,
- function_obj_tag>::type ptr_or_obj_tag;
+ typedef typename mpl::if_c<(is_pointer<F>::value),
+ function_ptr_tag,
+ function_obj_tag>::type ptr_or_obj_tag;
- typedef typename ct_if<(is_member_pointer<F>::value),
- member_ptr_tag,
- ptr_or_obj_tag>::type ptr_or_obj_or_mem_tag;
+ typedef typename mpl::if_c<(is_member_pointer<F>::value),
+ member_ptr_tag,
+ ptr_or_obj_tag>::type ptr_or_obj_or_mem_tag;
- typedef typename ct_if<(is_reference_wrapper<F>::value),
- function_obj_ref_tag,
- ptr_or_obj_or_mem_tag>::type or_ref_tag;
+ typedef typename mpl::if_c<(is_reference_wrapper<F>::value),
+ function_obj_ref_tag,
+ ptr_or_obj_or_mem_tag>::type or_ref_tag;
public:
- typedef typename ct_if<(is_stateless<F>::value),
- stateless_function_obj_tag,
- or_ref_tag>::type type;
+ typedef or_ref_tag type;
};
// The trivial manager does nothing but return the same pointer (if we
// are cloning) or return the null pointer (if we are deleting).
- inline any_pointer trivial_manager(any_pointer f,
- functor_manager_operation_type op)
+ template<typename F>
+ struct reference_manager
{
- if (op == clone_functor_tag)
- return f;
- else
- return make_any_pointer(reinterpret_cast<void*>(0));
- }
+ static inline void
+ get(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op)
+ {
+ switch (op) {
+ case clone_functor_tag:
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ return;
+
+ case destroy_functor_tag:
+ out_buffer.obj_ptr = 0;
+ return;
+
+ case check_functor_type_tag:
+ {
+ // DPG TBD: Since we're only storing a pointer, it's
+ // possible that the user could ask for a base class or
+ // derived class. Is that okay?
+ const BOOST_FUNCTION_STD_NS::type_info& check_type =
+ *static_cast<const BOOST_FUNCTION_STD_NS::type_info*>(out_buffer.const_obj_ptr);
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(F)))
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ }
+ return;
+
+ case get_functor_type_tag:
+ out_buffer.const_obj_ptr = &typeid(F);
+ return;
+ }
+ }
+ };
+
+ /**
+ * Determine if boost::function can use the small-object
+ * optimization with the function object type F.
+ */
+ template<typename F>
+ struct function_allows_small_object_optimization
+ {
+ BOOST_STATIC_CONSTANT
+ (bool,
+ value = ((sizeof(F) <= sizeof(function_buffer) &&
+ (alignment_of<function_buffer>::value
+ % alignment_of<F>::value == 0))));
+ };
+
+ template <typename F,typename A>
+ struct functor_wrapper: public F, public A
+ {
+ functor_wrapper( F f, A a ):
+ F(f),
+ A(a)
+ {
+ }
+ };
/**
* The functor_manager class contains a static function "manage" which
* can clone or destroy the given function/function object pointer.
*/
- template<typename Functor, typename Allocator>
- struct functor_manager
+ template<typename Functor>
+ struct functor_manager_common
{
- private:
typedef Functor functor_type;
- // For function pointers, the manager is trivial
- static inline any_pointer
- manager(any_pointer function_ptr,
- functor_manager_operation_type op,
- function_ptr_tag)
+ // Function pointers
+ static inline void
+ manage_ptr(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op)
{
if (op == clone_functor_tag)
- return function_ptr;
- else
- return make_any_pointer(static_cast<void (*)()>(0));
+ out_buffer.func_ptr = in_buffer.func_ptr;
+ else if (op == destroy_functor_tag)
+ out_buffer.func_ptr = 0;
+ else /* op == check_functor_type_tag */ {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type =
+ *static_cast<const BOOST_FUNCTION_STD_NS::type_info*>(out_buffer.const_obj_ptr);
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = &in_buffer.func_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ }
}
- // For function object pointers, we clone the pointer to each
- // function has its own version.
- static inline any_pointer
- manager(any_pointer function_obj_ptr,
- functor_manager_operation_type op,
- function_obj_tag)
+ // Function objects that fit in the small-object buffer.
+ static inline void
+ manage_small(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op)
{
-#ifndef BOOST_NO_STD_ALLOCATOR
- typedef typename Allocator::template rebind<functor_type>::other
- allocator_type;
- typedef typename allocator_type::pointer pointer_type;
-#else
- typedef functor_type* pointer_type;
-#endif // BOOST_NO_STD_ALLOCATOR
+ if (op == clone_functor_tag) {
+ const functor_type* in_functor =
+ reinterpret_cast<const functor_type*>(&in_buffer.data);
+ new ((void*)&out_buffer.data) functor_type(*in_functor);
+ } else if (op == destroy_functor_tag) {
+ // Some compilers (Borland, vc6, ...) are unhappy with ~functor_type.
+ reinterpret_cast<functor_type*>(&out_buffer.data)->~Functor();
+ } else /* op == check_functor_type_tag */ {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type =
+ *static_cast<const BOOST_FUNCTION_STD_NS::type_info*>(out_buffer.const_obj_ptr);
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = &in_buffer.data;
+ else
+ out_buffer.obj_ptr = 0;
+ }
+ }
+ };
-# ifndef BOOST_NO_STD_ALLOCATOR
- allocator_type allocator;
-# endif // BOOST_NO_STD_ALLOCATOR
+ template<typename Functor>
+ struct functor_manager
+ {
+ private:
+ typedef Functor functor_type;
- if (op == clone_functor_tag) {
- functor_type* f =
- static_cast<functor_type*>(function_obj_ptr.obj_ptr);
+ // Function pointers
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, function_ptr_tag)
+ {
+ functor_manager_common<Functor>::manage_ptr(in_buffer,out_buffer,op);
+ }
+ // Function objects that fit in the small-object buffer.
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, mpl::true_)
+ {
+ functor_manager_common<Functor>::manage_small(in_buffer,out_buffer,op);
+ }
+
+ // Function objects that require heap allocation
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, mpl::false_)
+ {
+ if (op == clone_functor_tag) {
// Clone the functor
-# ifndef BOOST_NO_STD_ALLOCATOR
- pointer_type copy = allocator.allocate(1);
- allocator.construct(copy, *f);
-
- // Get back to the original pointer type
- functor_type* new_f = static_cast<functor_type*>(copy);
-# else
+ // GCC 2.95.3 gets the CV qualifiers wrong here, so we
+ // can't do the static_cast that we should do.
+ const functor_type* f =
+ (const functor_type*)(in_buffer.obj_ptr);
functor_type* new_f = new functor_type(*f);
-# endif // BOOST_NO_STD_ALLOCATOR
- return make_any_pointer(static_cast<void*>(new_f));
- }
- else {
+ out_buffer.obj_ptr = new_f;
+ } else if (op == destroy_functor_tag) {
/* Cast from the void pointer to the functor pointer type */
functor_type* f =
- reinterpret_cast<functor_type*>(function_obj_ptr.obj_ptr);
-
-# ifndef BOOST_NO_STD_ALLOCATOR
- /* Cast from the functor pointer type to the allocator's pointer
- type */
- pointer_type victim = static_cast<pointer_type>(f);
-
- // Destroy and deallocate the functor
- allocator.destroy(victim);
- allocator.deallocate(victim, 1);
-# else
+ static_cast<functor_type*>(out_buffer.obj_ptr);
delete f;
-# endif // BOOST_NO_STD_ALLOCATOR
-
- return make_any_pointer(static_cast<void*>(0));
+ out_buffer.obj_ptr = 0;
+ } else /* op == check_functor_type_tag */ {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type =
+ *static_cast<const BOOST_FUNCTION_STD_NS::type_info*>(out_buffer.const_obj_ptr);
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ else
+ out_buffer.obj_ptr = 0;
}
}
+
+ // For function objects, we determine whether the function
+ // object can use the small-object optimization buffer or
+ // whether we need to allocate it on the heap.
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, function_obj_tag)
+ {
+ manager(in_buffer, out_buffer, op,
+ mpl::bool_<(function_allows_small_object_optimization<functor_type>::value)>());
+ }
+
public:
/* Dispatch to an appropriate manager based on whether we have a
function pointer or a function object pointer. */
- static any_pointer
- manage(any_pointer functor_ptr, functor_manager_operation_type op)
+ static inline void
+ manage(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op)
{
typedef typename get_function_tag<functor_type>::type tag_type;
- return manager(functor_ptr, op, tag_type());
+ switch (op) {
+ case get_functor_type_tag:
+ out_buffer.const_obj_ptr = &typeid(functor_type);
+ return;
+
+ default:
+ manager(in_buffer, out_buffer, op, tag_type());
+ return;
+ }
}
};
-#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
- template<bool cond, typename T> struct enable_if;
- template<typename T> struct enable_if<true, T> { typedef T type; };
- template<typename T> struct enable_if<false, T> {};
-
- template<bool x>
- struct enabled
- {
- template<typename T>
- struct base
+ template<typename Functor, typename Allocator>
+ struct functor_manager_a
{
- typedef T type;
- };
- };
+ private:
+ typedef Functor functor_type;
- template<>
- struct enabled<false>
- {
- template<typename T>
- struct base
- {
- };
- };
+ // Function pointers
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, function_ptr_tag)
+ {
+ functor_manager_common<Functor>::manage_ptr(in_buffer,out_buffer,op);
+ }
- template<bool Enabled, typename T>
- struct enable_if : public enabled<Enabled>::template base<T>
- {
- };
-#endif
+ // Function objects that fit in the small-object buffer.
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, mpl::true_)
+ {
+ functor_manager_common<Functor>::manage_small(in_buffer,out_buffer,op);
+ }
+
+ // Function objects that require heap allocation
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, mpl::false_)
+ {
+ typedef functor_wrapper<Functor,Allocator> functor_wrapper_type;
+ typedef typename Allocator::template rebind<functor_wrapper_type>::other
+ wrapper_allocator_type;
+ typedef typename wrapper_allocator_type::pointer wrapper_allocator_pointer_type;
+
+ if (op == clone_functor_tag) {
+ // Clone the functor
+ // GCC 2.95.3 gets the CV qualifiers wrong here, so we
+ // can't do the static_cast that we should do.
+ const functor_wrapper_type* f =
+ (const functor_wrapper_type*)(in_buffer.obj_ptr);
+ wrapper_allocator_type wrapper_allocator(static_cast<Allocator const &>(*f));
+ wrapper_allocator_pointer_type copy = wrapper_allocator.allocate(1);
+ wrapper_allocator.construct(copy, *f);
+
+ // Get back to the original pointer type
+ functor_wrapper_type* new_f = static_cast<functor_wrapper_type*>(copy);
+ out_buffer.obj_ptr = new_f;
+ } else if (op == destroy_functor_tag) {
+ /* Cast from the void pointer to the functor_wrapper_type */
+ functor_wrapper_type* victim =
+ static_cast<functor_wrapper_type*>(in_buffer.obj_ptr);
+ wrapper_allocator_type wrapper_allocator(static_cast<Allocator const &>(*victim));
+ wrapper_allocator.destroy(victim);
+ wrapper_allocator.deallocate(victim,1);
+ out_buffer.obj_ptr = 0;
+ } else /* op == check_functor_type_tag */ {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type =
+ *static_cast<const BOOST_FUNCTION_STD_NS::type_info*>(out_buffer.const_obj_ptr);
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ }
+ }
+
+ // For function objects, we determine whether the function
+ // object can use the small-object optimization buffer or
+ // whether we need to allocate it on the heap.
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, function_obj_tag)
+ {
+ manager(in_buffer, out_buffer, op,
+ mpl::bool_<(function_allows_small_object_optimization<functor_type>::value)>());
+ }
+
+ public:
+ /* Dispatch to an appropriate manager based on whether we have a
+ function pointer or a function object pointer. */
+ static inline void
+ manage(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op)
+ {
+ typedef typename get_function_tag<functor_type>::type tag_type;
+ switch (op) {
+ case get_functor_type_tag:
+ out_buffer.const_obj_ptr = &typeid(functor_type);
+ return;
+
+ default:
+ manager(in_buffer, out_buffer, op, tag_type());
+ return;
+ }
+ }
+ };
// A type that is only used for comparisons against zero
struct useless_clear_type {};
+
+#ifdef BOOST_NO_SFINAE
+ // These routines perform comparisons between a Boost.Function
+ // object and an arbitrary function object (when the last
+ // parameter is mpl::bool_<false>) or against zero (when the
+ // last parameter is mpl::bool_<true>). They are only necessary
+ // for compilers that don't support SFINAE.
+ template<typename Function, typename Functor>
+ bool
+ compare_equal(const Function& f, const Functor&, int, mpl::bool_<true>)
+ { return f.empty(); }
+
+ template<typename Function, typename Functor>
+ bool
+ compare_not_equal(const Function& f, const Functor&, int,
+ mpl::bool_<true>)
+ { return !f.empty(); }
+
+ template<typename Function, typename Functor>
+ bool
+ compare_equal(const Function& f, const Functor& g, long,
+ mpl::bool_<false>)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return function_equal(*fp, g);
+ else return false;
+ }
+
+ template<typename Function, typename Functor>
+ bool
+ compare_equal(const Function& f, const reference_wrapper<Functor>& g,
+ int, mpl::bool_<false>)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return fp == g.get_pointer();
+ else return false;
+ }
+
+ template<typename Function, typename Functor>
+ bool
+ compare_not_equal(const Function& f, const Functor& g, long,
+ mpl::bool_<false>)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return !function_equal(*fp, g);
+ else return true;
+ }
+
+ template<typename Function, typename Functor>
+ bool
+ compare_not_equal(const Function& f,
+ const reference_wrapper<Functor>& g, int,
+ mpl::bool_<false>)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return fp != g.get_pointer();
+ else return true;
+ }
+#endif // BOOST_NO_SFINAE
+
+ /**
+ * Stores the "manager" portion of the vtable for a
+ * boost::function object.
+ */
+ struct vtable_base
+ {
+ vtable_base() : manager(0) { }
+ void (*manager)(const function_buffer& in_buffer,
+ function_buffer& out_buffer,
+ functor_manager_operation_type op);
+ };
} // end namespace function
} // end namespace detail
class function_base
{
public:
- function_base() : manager(0)
+ function_base() : vtable(0) { }
+
+ /** Determine if the function is empty (i.e., has no target). */
+ bool empty() const { return !vtable; }
+
+ /** Retrieve the type of the stored function object, or typeid(void)
+ if this is empty. */
+ const BOOST_FUNCTION_STD_NS::type_info& target_type() const
{
- functor.obj_ptr = 0;
+ if (!vtable) return typeid(void);
+
+ detail::function::function_buffer type;
+ vtable->manager(functor, type, detail::function::get_functor_type_tag);
+ return *static_cast<const BOOST_FUNCTION_STD_NS::type_info*>(type.const_obj_ptr);
}
- // Is this function empty?
- bool empty() const { return !manager; }
+ template<typename Functor>
+ Functor* target()
+ {
+ if (!vtable) return 0;
+
+ detail::function::function_buffer type_result;
+ type_result.const_obj_ptr = &typeid(Functor);
+ vtable->manager(functor, type_result,
+ detail::function::check_functor_type_tag);
+ return static_cast<Functor*>(type_result.obj_ptr);
+ }
+
+ template<typename Functor>
+#if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+ const Functor* target( Functor * = 0 ) const
+#else
+ const Functor* target() const
+#endif
+ {
+ if (!vtable) return 0;
+
+ detail::function::function_buffer type_result;
+ type_result.const_obj_ptr = &typeid(Functor);
+ vtable->manager(functor, type_result,
+ detail::function::check_functor_type_tag);
+ // GCC 2.95.3 gets the CV qualifiers wrong here, so we
+ // can't do the static_cast that we should do.
+ return (const Functor*)(type_result.obj_ptr);
+ }
+
+ template<typename F>
+ bool contains(const F& f) const
+ {
+#if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+ if (const F* fp = this->target( (F*)0 ))
+#else
+ if (const F* fp = this->template target<F>())
+#endif
+ {
+ return function_equal(*fp, f);
+ } else {
+ return false;
+ }
+ }
+
+#if defined(__GNUC__) && __GNUC__ == 3 && __GNUC_MINOR__ <= 3
+ // GCC 3.3 and newer cannot copy with the global operator==, due to
+ // problems with instantiation of function return types before it
+ // has been verified that the argument types match up.
+ template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator==(Functor g) const
+ {
+ if (const Functor* fp = target<Functor>())
+ return function_equal(*fp, g);
+ else return false;
+ }
+
+ template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator!=(Functor g) const
+ {
+ if (const Functor* fp = target<Functor>())
+ return !function_equal(*fp, g);
+ else return true;
+ }
+#endif
public: // should be protected, but GCC 2.95.3 will fail to allow access
- detail::function::any_pointer (*manager)(
- detail::function::any_pointer,
- detail::function::functor_manager_operation_type);
- detail::function::any_pointer functor;
+ detail::function::vtable_base* vtable;
+ mutable detail::function::function_buffer functor;
};
/**
bad_function_call() : std::runtime_error("call to empty boost::function") {}
};
-/* Poison comparison between Boost.Function objects (because it is
- * meaningless). The comparisons would otherwise be allowed because of the
- * conversion required to allow syntax such as:
- * boost::function<int, int> f;
- * if (f) { f(5); }
- */
-void operator==(const function_base&, const function_base&);
-void operator!=(const function_base&, const function_base&);
-
-#if BOOST_WORKAROUND(BOOST_MSVC, <= 1310)
+#ifndef BOOST_NO_SFINAE
inline bool operator==(const function_base& f,
detail::function::useless_clear_type*)
{
}
#endif
+#ifdef BOOST_NO_SFINAE
+// Comparisons between boost::function objects and arbitrary function objects
+template<typename Functor>
+ inline bool operator==(const function_base& f, Functor g)
+ {
+ typedef mpl::bool_<(is_integral<Functor>::value)> integral;
+ return detail::function::compare_equal(f, g, 0, integral());
+ }
+
+template<typename Functor>
+ inline bool operator==(Functor g, const function_base& f)
+ {
+ typedef mpl::bool_<(is_integral<Functor>::value)> integral;
+ return detail::function::compare_equal(f, g, 0, integral());
+ }
+
+template<typename Functor>
+ inline bool operator!=(const function_base& f, Functor g)
+ {
+ typedef mpl::bool_<(is_integral<Functor>::value)> integral;
+ return detail::function::compare_not_equal(f, g, 0, integral());
+ }
+
+template<typename Functor>
+ inline bool operator!=(Functor g, const function_base& f)
+ {
+ typedef mpl::bool_<(is_integral<Functor>::value)> integral;
+ return detail::function::compare_not_equal(f, g, 0, integral());
+ }
+#else
+
+# if !(defined(__GNUC__) && __GNUC__ == 3 && __GNUC_MINOR__ <= 3)
+// Comparisons between boost::function objects and arbitrary function
+// objects. GCC 3.3 and before has an obnoxious bug that prevents this
+// from working.
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator==(const function_base& f, Functor g)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return function_equal(*fp, g);
+ else return false;
+ }
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator==(Functor g, const function_base& f)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return function_equal(g, *fp);
+ else return false;
+ }
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator!=(const function_base& f, Functor g)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return !function_equal(*fp, g);
+ else return true;
+ }
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator!=(Functor g, const function_base& f)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return !function_equal(g, *fp);
+ else return true;
+ }
+# endif
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator==(const function_base& f, reference_wrapper<Functor> g)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return fp == g.get_pointer();
+ else return false;
+ }
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator==(reference_wrapper<Functor> g, const function_base& f)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return g.get_pointer() == fp;
+ else return false;
+ }
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator!=(const function_base& f, reference_wrapper<Functor> g)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return fp != g.get_pointer();
+ else return true;
+ }
+
+template<typename Functor>
+ BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool)
+ operator!=(reference_wrapper<Functor> g, const function_base& f)
+ {
+ if (const Functor* fp = f.template target<Functor>())
+ return g.get_pointer() != fp;
+ else return true;
+ }
+
+#endif // Compiler supporting SFINAE
+
namespace detail {
namespace function {
inline bool has_empty_target(const function_base* f)
return f->empty();
}
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1310)
+ inline bool has_empty_target(const void*)
+ {
+ return false;
+ }
+#else
inline bool has_empty_target(...)
{
return false;
}
+#endif
} // end namespace function
} // end namespace detail
} // end namespace boost
+#undef BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL
+#undef BOOST_FUNCTION_COMPARE_TYPE_ID
+
#endif // BOOST_FUNCTION_BASE_HEADER
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