// 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