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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/function/function_base.hpp
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+// Boost.Function library
+
+// 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
+
+#ifndef BOOST_FUNCTION_BASE_HEADER
+#define BOOST_FUNCTION_BASE_HEADER
+
+#include <stdexcept>
+#include <string>
+#include <memory>
+#include <new>
+#include <typeinfo>
+#include <boost/config.hpp>
+#include <boost/assert.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_integral.hpp>
+#include <boost/type_traits/is_volatile.hpp>
+#include <boost/type_traits/composite_traits.hpp>
+#include <boost/type_traits/ice.hpp>
+#include <boost/ref.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>
+#include <boost/function/function_fwd.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
+#else
+# define BOOST_FUNCTION_TARGET_FIX(x)
+#endif // not MSVC
+
+#if !BOOST_WORKAROUND(__BORLANDC__, < 0x5A0)
+# 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
+
+namespace boost {
+ namespace detail {
+ namespace function {
+ class X;
+
+ /**
+ * 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
+ mutable void* obj_ptr;
+
+ // For pointers to std::type_info objects
+ struct type_t {
+ // (get_functor_type_tag, check_functor_type_tag).
+ const BOOST_FUNCTION_STD_NS::type_info* type;
+
+ // Whether the type is const-qualified.
+ bool const_qualified;
+ // Whether the type is volatile-qualified.
+ bool volatile_qualified;
+ } type;
+
+ // For function pointers of all kinds
+ mutable void (*func_ptr)();
+
+ // For bound member pointers
+ struct bound_memfunc_ptr_t {
+ void (X::*memfunc_ptr)(int);
+ void* obj_ptr;
+ } bound_memfunc_ptr;
+
+ // For references to function objects. We explicitly keep
+ // track of the cv-qualifiers on the object referenced.
+ struct obj_ref_t {
+ mutable void* obj_ptr;
+ bool is_const_qualified;
+ bool is_volatile_qualified;
+ } obj_ref;
+
+ // To relax aliasing constraints
+ mutable char data;
+ };
+
+ /**
+ * The unusable class is a placeholder for unused function arguments
+ * It is also completely unusable except that it constructable from
+ * anything. This helps compilers without partial specialization to
+ * handle Boost.Function objects returning void.
+ */
+ struct unusable
+ {
+ unusable() {}
+ template<typename T> unusable(const T&) {}
+ };
+
+ /* Determine the return type. This supports compilers that do not support
+ * void returns or partial specialization by silently changing the return
+ * type to "unusable".
+ */
+ template<typename T> struct function_return_type { typedef T type; };
+
+ template<>
+ struct function_return_type<void>
+ {
+ typedef unusable type;
+ };
+
+ // The operation type to perform on the given functor/function pointer
+ enum functor_manager_operation_type {
+ clone_functor_tag,
+ move_functor_tag,
+ destroy_functor_tag,
+ check_functor_type_tag,
+ get_functor_type_tag
+ };
+
+ // Tags used to decide between different types of functions
+ struct function_ptr_tag {};
+ struct function_obj_tag {};
+ struct member_ptr_tag {};
+ struct function_obj_ref_tag {};
+
+ template<typename F>
+ class get_function_tag
+ {
+ typedef typename mpl::if_c<(is_pointer<F>::value),
+ function_ptr_tag,
+ function_obj_tag>::type ptr_or_obj_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 mpl::if_c<(is_reference_wrapper<F>::value),
+ function_obj_ref_tag,
+ ptr_or_obj_or_mem_tag>::type or_ref_tag;
+
+ public:
+ 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).
+ template<typename F>
+ struct reference_manager
+ {
+ static inline void
+ manage(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op)
+ {
+ switch (op) {
+ case clone_functor_tag:
+ out_buffer.obj_ref.obj_ptr = in_buffer.obj_ref.obj_ptr;
+ return;
+
+ case move_functor_tag:
+ out_buffer.obj_ref.obj_ptr = in_buffer.obj_ref.obj_ptr;
+ in_buffer.obj_ref.obj_ptr = 0;
+ return;
+
+ case destroy_functor_tag:
+ out_buffer.obj_ref.obj_ptr = 0;
+ return;
+
+ case check_functor_type_tag:
+ {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type
+ = *out_buffer.type.type;
+
+ // Check whether we have the same type. We can add
+ // cv-qualifiers, but we can't take them away.
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(F))
+ && (!in_buffer.obj_ref.is_const_qualified
+ || out_buffer.type.const_qualified)
+ && (!in_buffer.obj_ref.is_volatile_qualified
+ || out_buffer.type.volatile_qualified))
+ out_buffer.obj_ptr = in_buffer.obj_ref.obj_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ }
+ return;
+
+ case get_functor_type_tag:
+ out_buffer.type.type = &typeid(F);
+ out_buffer.type.const_qualified = in_buffer.obj_ref.is_const_qualified;
+ out_buffer.type.volatile_qualified = in_buffer.obj_ref.is_volatile_qualified;
+ 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>
+ struct functor_manager_common
+ {
+ typedef Functor functor_type;
+
+ // 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)
+ out_buffer.func_ptr = in_buffer.func_ptr;
+ else if (op == move_functor_tag) {
+ out_buffer.func_ptr = in_buffer.func_ptr;
+ in_buffer.func_ptr = 0;
+ } else if (op == destroy_functor_tag)
+ out_buffer.func_ptr = 0;
+ else if (op == check_functor_type_tag) {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type
+ = *out_buffer.type.type;
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = &in_buffer.func_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ } else /* op == get_functor_type_tag */ {
+ out_buffer.type.type = &typeid(Functor);
+ out_buffer.type.const_qualified = false;
+ out_buffer.type.volatile_qualified = false;
+ }
+ }
+
+ // 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)
+ {
+ if (op == clone_functor_tag || op == move_functor_tag) {
+ const functor_type* in_functor =
+ reinterpret_cast<const functor_type*>(&in_buffer.data);
+ new ((void*)&out_buffer.data) functor_type(*in_functor);
+
+ if (op == move_functor_tag) {
+ reinterpret_cast<functor_type*>(&in_buffer.data)->~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 if (op == check_functor_type_tag) {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type
+ = *out_buffer.type.type;
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = &in_buffer.data;
+ else
+ out_buffer.obj_ptr = 0;
+ } else /* op == get_functor_type_tag */ {
+ out_buffer.type.type = &typeid(Functor);
+ out_buffer.type.const_qualified = false;
+ out_buffer.type.volatile_qualified = false;
+ }
+ }
+ };
+
+ template<typename Functor>
+ struct functor_manager
+ {
+ private:
+ typedef Functor functor_type;
+
+ // 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
+ // 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);
+ out_buffer.obj_ptr = new_f;
+ } else if (op == move_functor_tag) {
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ in_buffer.obj_ptr = 0;
+ } else if (op == destroy_functor_tag) {
+ /* Cast from the void pointer to the functor pointer type */
+ functor_type* f =
+ static_cast<functor_type*>(out_buffer.obj_ptr);
+ delete f;
+ out_buffer.obj_ptr = 0;
+ } else if (op == check_functor_type_tag) {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type
+ = *out_buffer.type.type;
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ } else /* op == get_functor_type_tag */ {
+ out_buffer.type.type = &typeid(Functor);
+ out_buffer.type.const_qualified = false;
+ out_buffer.type.volatile_qualified = false;
+ }
+ }
+
+ // 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)>());
+ }
+
+ // For member pointers, we use the small-object optimization buffer.
+ static inline void
+ manager(const function_buffer& in_buffer, function_buffer& out_buffer,
+ functor_manager_operation_type op, member_ptr_tag)
+ {
+ manager(in_buffer, out_buffer, op, mpl::true_());
+ }
+
+ 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.type.type = &typeid(functor_type);
+ out_buffer.type.const_qualified = false;
+ out_buffer.type.volatile_qualified = false;
+ return;
+
+ default:
+ manager(in_buffer, out_buffer, op, tag_type());
+ return;
+ }
+ }
+ };
+
+ template<typename Functor, typename Allocator>
+ struct functor_manager_a
+ {
+ private:
+ typedef Functor functor_type;
+
+ // 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_)
+ {
+ 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 == move_functor_tag) {
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ in_buffer.obj_ptr = 0;
+ } 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 if (op == check_functor_type_tag) {
+ const BOOST_FUNCTION_STD_NS::type_info& check_type
+ = *out_buffer.type.type;
+ if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor)))
+ out_buffer.obj_ptr = in_buffer.obj_ptr;
+ else
+ out_buffer.obj_ptr = 0;
+ } else /* op == get_functor_type_tag */ {
+ out_buffer.type.type = &typeid(Functor);
+ out_buffer.type.const_qualified = false;
+ out_buffer.type.volatile_qualified = false;
+ }
+ }
+
+ // 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.type.type = &typeid(functor_type);
+ out_buffer.type.const_qualified = false;
+ out_buffer.type.volatile_qualified = false;
+ 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
+ {
+ void (*manager)(const function_buffer& in_buffer,
+ function_buffer& out_buffer,
+ functor_manager_operation_type op);
+ };
+ } // end namespace function
+ } // end namespace detail
+
+/**
+ * The function_base class contains the basic elements needed for the
+ * function1, function2, function3, etc. classes. It is common to all
+ * functions (and as such can be used to tell if we have one of the
+ * functionN objects).
+ */
+class function_base
+{
+public:
+ 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
+ {
+ if (!vtable) return typeid(void);
+
+ detail::function::function_buffer type;
+ vtable->manager(functor, type, detail::function::get_functor_type_tag);
+ return *type.type.type;
+ }
+
+ template<typename Functor>
+ Functor* target()
+ {
+ if (!vtable) return 0;
+
+ detail::function::function_buffer type_result;
+ type_result.type.type = &typeid(Functor);
+ type_result.type.const_qualified = is_const<Functor>::value;
+ type_result.type.volatile_qualified = is_volatile<Functor>::value;
+ 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.type.type = &typeid(Functor);
+ type_result.type.const_qualified = true;
+ type_result.type.volatile_qualified = is_volatile<Functor>::value;
+ 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::vtable_base* vtable;
+ mutable detail::function::function_buffer functor;
+};
+
+/**
+ * The bad_function_call exception class is thrown when a boost::function
+ * object is invoked
+ */
+class bad_function_call : public std::runtime_error
+{
+public:
+ bad_function_call() : std::runtime_error("call to empty boost::function") {}
+};
+
+#ifndef BOOST_NO_SFINAE
+inline bool operator==(const function_base& f,
+ detail::function::useless_clear_type*)
+{
+ return f.empty();
+}
+
+inline bool operator!=(const function_base& f,
+ detail::function::useless_clear_type*)
+{
+ return !f.empty();
+}
+
+inline bool operator==(detail::function::useless_clear_type*,
+ const function_base& f)
+{
+ return f.empty();
+}
+
+inline bool operator!=(detail::function::useless_clear_type*,
+ const function_base& f)
+{
+ return !f.empty();
+}
+#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