summaryrefslogtreecommitdiff
path: root/boost/interprocess/offset_ptr.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'boost/interprocess/offset_ptr.hpp')
-rw-r--r--boost/interprocess/offset_ptr.hpp130
1 files changed, 72 insertions, 58 deletions
diff --git a/boost/interprocess/offset_ptr.hpp b/boost/interprocess/offset_ptr.hpp
index fca444eaa4..24b044adf4 100644
--- a/boost/interprocess/offset_ptr.hpp
+++ b/boost/interprocess/offset_ptr.hpp
@@ -23,6 +23,9 @@
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type_traits/is_constructible.hpp>
+#include <boost/type_traits/is_integral.hpp>
+#include <boost/type_traits/is_unsigned.hpp>
#include <boost/interprocess/interprocess_fwd.hpp>
#include <boost/interprocess/detail/utilities.hpp>
@@ -55,6 +58,7 @@ namespace ipcdetail {
union offset_ptr_internal
{
BOOST_STATIC_ASSERT(sizeof(OffsetType) >= sizeof(uintptr_t));
+ BOOST_STATIC_ASSERT(boost::is_integral<OffsetType>::value && boost::is_unsigned<OffsetType>::value);
explicit offset_ptr_internal(OffsetType off)
: m_offset(off)
@@ -81,20 +85,21 @@ namespace ipcdetail {
//
////////////////////////////////////////////////////////////////////////
#define BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_PTR
- BOOST_INTERPROCESS_FORCEINLINE void * offset_ptr_to_raw_pointer(const volatile void *this_ptr, uintptr_t offset)
+ template <class OffsetType>
+ BOOST_INTERPROCESS_FORCEINLINE void * offset_ptr_to_raw_pointer(const volatile void *this_ptr, OffsetType offset)
{
- typedef pointer_uintptr_caster<void*> caster_t;
+ typedef pointer_offset_caster<void*, OffsetType> caster_t;
#ifndef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_PTR
if(offset == 1){
return 0;
}
else{
- return caster_t(caster_t(this_ptr).uintptr() + offset).pointer();
+ return caster_t(caster_t(this_ptr).offset() + offset).pointer();
}
#else
- uintptr_t mask = offset == 1;
+ OffsetType mask = offset == 1;
--mask;
- uintptr_t target_offset = caster_t(this_ptr).uintptr() + offset;
+ OffsetType target_offset = caster_t(this_ptr).offset() + offset;
target_offset &= mask;
return caster_t(target_offset).pointer();
#endif
@@ -106,27 +111,28 @@ namespace ipcdetail {
//
////////////////////////////////////////////////////////////////////////
#define BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF
- BOOST_INTERPROCESS_FORCEINLINE uintptr_t offset_ptr_to_offset(const volatile void *ptr, const volatile void *this_ptr)
+ template<class OffsetType>
+ BOOST_INTERPROCESS_FORCEINLINE OffsetType offset_ptr_to_offset(const volatile void *ptr, const volatile void *this_ptr)
{
- typedef pointer_uintptr_caster<void*> caster_t;
+ typedef pointer_offset_caster<void*, OffsetType> caster_t;
#ifndef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF
//offset == 1 && ptr != 0 is not legal for this pointer
if(!ptr){
return 1;
}
else{
- uintptr_t offset = caster_t(ptr).uintptr() - caster_t(this_ptr).uintptr();
+ OffsetType offset = caster_t(ptr).offset()- caster_t(this_ptr).offset();
BOOST_ASSERT(offset != 1);
return offset;
}
#else
- //const uintptr_t other = -uintptr_t(ptr != 0);
- //const uintptr_t offset = (caster_t(ptr).uintptr() - caster_t(this_ptr).uintptr()) & other;
- //return offset + uintptr_t(!other);
+ //const OffsetType other = -OffsetType(ptr != 0);
+ //const OffsetType offset = (caster_t(ptr).offset() - caster_t(this_ptr).offset()) & other;
+ //return offset + OffsetType(!other);
//
- uintptr_t offset = caster_t(ptr).uintptr() - caster_t(this_ptr).uintptr();
+ OffsetType offset = caster_t(ptr).offset() - caster_t(this_ptr).offset();
--offset;
- uintptr_t mask = uintptr_t(ptr == 0);
+ OffsetType mask = ptr == 0;
--mask;
offset &= mask;
return ++offset;
@@ -139,28 +145,29 @@ namespace ipcdetail {
//
////////////////////////////////////////////////////////////////////////
#define BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF_FROM_OTHER
- BOOST_INTERPROCESS_FORCEINLINE uintptr_t offset_ptr_to_offset_from_other
- (const volatile void *this_ptr, const volatile void *other_ptr, uintptr_t other_offset)
+ template<class OffsetType>
+ BOOST_INTERPROCESS_FORCEINLINE OffsetType offset_ptr_to_offset_from_other
+ (const volatile void *this_ptr, const volatile void *other_ptr, OffsetType other_offset)
{
- typedef pointer_uintptr_caster<void*> caster_t;
+ typedef pointer_offset_caster<void*, OffsetType> caster_t;
#ifndef BOOST_INTERPROCESS_OFFSET_PTR_BRANCHLESS_TO_OFF_FROM_OTHER
if(other_offset == 1){
return 1;
}
else{
- uintptr_t offset = caster_t(other_ptr).uintptr() - caster_t(this_ptr).uintptr() + other_offset;
+ OffsetType offset = caster_t(other_ptr).offset() - caster_t(this_ptr).offset() + other_offset;
BOOST_ASSERT(offset != 1);
return offset;
}
#else
- uintptr_t mask = other_offset == 1;
+ OffsetType mask = other_offset == 1;
--mask;
- uintptr_t offset = caster_t(other_ptr).uintptr() - caster_t(this_ptr).uintptr();
+ OffsetType offset = caster_t(other_ptr).offset() - caster_t(this_ptr).offset();
offset &= mask;
return offset + other_offset;
- //uintptr_t mask = -uintptr_t(other_offset != 1);
- //uintptr_t offset = caster_t(other_ptr).uintptr() - caster_t(this_ptr).uintptr();
+ //OffsetType mask = -OffsetType(other_offset != 1);
+ //OffsetType offset = caster_t(other_ptr).offset() - caster_t(this_ptr).offset();
//offset &= mask;
//return offset + other_offset;
#endif
@@ -215,9 +222,9 @@ namespace ipcdetail {
//!
//!<b>Note</b>: offset_ptr uses implementation defined properties, present in most platforms, for
//!performance reasons:
-//! - Assumes that uintptr_t representation of nullptr is (uintptr_t)zero.
-//! - Assumes that incrementing a uintptr_t obtained from a pointer is equivalent
-//! to incrementing the pointer and then converting it back to uintptr_t.
+//! - Assumes that OffsetType representation of nullptr is (OffsetType)zero.
+//! - Assumes that incrementing a OffsetType obtained from a pointer is equivalent
+//! to incrementing the pointer and then converting it back to OffsetType.
template <class PointedType, class DifferenceType, class OffsetType, std::size_t OffsetAlignment>
class offset_ptr
{
@@ -251,7 +258,7 @@ class offset_ptr
//!Constructor from raw pointer (allows "0" pointer conversion).
//!Never throws.
BOOST_INTERPROCESS_FORCEINLINE offset_ptr(pointer ptr) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset(ptr, this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(ptr, this))
{}
//!Constructor from other pointer.
@@ -259,78 +266,81 @@ class offset_ptr
template <class T>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr( T *ptr
, typename ipcdetail::enable_if< ::boost::is_convertible<T*, PointedType*> >::type * = 0) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset(static_cast<PointedType*>(ptr), this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(static_cast<PointedType*>(ptr), this))
{}
//!Constructor from other offset_ptr
//!Never throws.
BOOST_INTERPROCESS_FORCEINLINE offset_ptr(const offset_ptr& ptr) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.internal.m_offset)))
+ : internal(ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.internal.m_offset))
{}
- //!Constructor from other offset_ptr. If pointers of pointee types are
- //!convertible, offset_ptrs will be convertibles. Never throws.
+ //!Constructor from other offset_ptr. Only takes part in overload resolution
+ //!if T2* is convertible to PointedType*. Never throws.
template<class T2>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr( const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr
#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
, typename ipcdetail::enable_if_convertible_equal_address<T2, PointedType>::type* = 0
#endif
) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.get_offset())))
+ : internal(ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.get_offset()))
{}
#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
- //!Constructor from other offset_ptr. If pointers of pointee types are
- //!convertible, offset_ptrs will be convertibles. Never throws.
template<class T2>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr( const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr
, typename ipcdetail::enable_if_convertible_unequal_address<T2, PointedType>::type* = 0) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset(static_cast<PointedType*>(ptr.get()), this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(static_cast<PointedType*>(ptr.get()), this))
{}
#endif
+ //!Constructor from other offset_ptr. Only takes part in overload resolution
+ //!if PointedType* is constructible from T2* other than via a conversion (e.g. cast to a derived class). Never throws.
+ template<class T2>
+ BOOST_INTERPROCESS_FORCEINLINE explicit offset_ptr(const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr
+ #ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
+ , typename ipcdetail::enable_if_c<
+ !::boost::is_convertible<T2*, PointedType*>::value && ::boost::is_constructible<T2*, PointedType*>::value
+ >::type * = 0
+ #endif
+ ) BOOST_NOEXCEPT
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(static_cast<PointedType*>(ptr.get()), this))
+ {}
+
//!Emulates static_cast operator.
//!Never throws.
template<class T2, class P2, class O2, std::size_t A2>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::static_cast_tag) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset(static_cast<PointedType*>(r.get()), this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(static_cast<PointedType*>(r.get()), this))
{}
//!Emulates const_cast operator.
//!Never throws.
template<class T2, class P2, class O2, std::size_t A2>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::const_cast_tag) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset(const_cast<PointedType*>(r.get()), this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(const_cast<PointedType*>(r.get()), this))
{}
//!Emulates dynamic_cast operator.
//!Never throws.
template<class T2, class P2, class O2, std::size_t A2>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::dynamic_cast_tag) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset(dynamic_cast<PointedType*>(r.get()), this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(dynamic_cast<PointedType*>(r.get()), this))
{}
//!Emulates reinterpret_cast operator.
//!Never throws.
template<class T2, class P2, class O2, std::size_t A2>
BOOST_INTERPROCESS_FORCEINLINE offset_ptr(const offset_ptr<T2, P2, O2, A2> & r, ipcdetail::reinterpret_cast_tag) BOOST_NOEXCEPT
- : internal(static_cast<OffsetType>
- (ipcdetail::offset_ptr_to_offset(reinterpret_cast<PointedType*>(r.get()), this)))
+ : internal(ipcdetail::offset_ptr_to_offset<OffsetType>(reinterpret_cast<PointedType*>(r.get()), this))
{}
//!Obtains raw pointer from offset.
//!Never throws.
BOOST_INTERPROCESS_FORCEINLINE pointer get() const BOOST_NOEXCEPT
- { return (pointer)ipcdetail::offset_ptr_to_raw_pointer(this, this->internal.m_offset); }
+ { return static_cast<pointer>(ipcdetail::offset_ptr_to_raw_pointer(this, this->internal.m_offset)); }
BOOST_INTERPROCESS_FORCEINLINE offset_type get_offset() const BOOST_NOEXCEPT
{ return this->internal.m_offset; }
@@ -358,8 +368,7 @@ class offset_ptr
//!Never throws.
BOOST_INTERPROCESS_FORCEINLINE offset_ptr& operator= (pointer from) BOOST_NOEXCEPT
{
- this->internal.m_offset =
- static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset(from, this));
+ this->internal.m_offset = ipcdetail::offset_ptr_to_offset<OffsetType>(from, this);
return *this;
}
@@ -367,8 +376,7 @@ class offset_ptr
//!Never throws.
BOOST_INTERPROCESS_FORCEINLINE offset_ptr& operator= (const offset_ptr & ptr) BOOST_NOEXCEPT
{
- this->internal.m_offset =
- static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.internal.m_offset));
+ this->internal.m_offset = ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.internal.m_offset);
return *this;
}
@@ -444,9 +452,17 @@ class offset_ptr
//!Compatibility with pointer_traits
//!
+ #if defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
template <class U>
struct rebind
{ typedef offset_ptr<U, DifferenceType, OffsetType, OffsetAlignment> other; };
+ #else
+ template <class U>
+ using rebind = offset_ptr<U, DifferenceType, OffsetType, OffsetAlignment>;
+ #ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
+ typedef offset_ptr<PointedType, DifferenceType, OffsetType, OffsetAlignment> other;
+ #endif //BOOST_INTERPROCESS_DOXYGEN_INVOKED
+ #endif
//!Compatibility with pointer_traits
//!
@@ -546,15 +562,13 @@ class offset_ptr
template<class T2>
BOOST_INTERPROCESS_FORCEINLINE void assign(const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr, ipcdetail::bool_<true>) BOOST_NOEXCEPT
{ //no need to pointer adjustment
- this->internal.m_offset =
- static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset_from_other(this, &ptr, ptr.get_offset()));
+ this->internal.m_offset = ipcdetail::offset_ptr_to_offset_from_other<OffsetType>(this, &ptr, ptr.get_offset());
}
template<class T2>
BOOST_INTERPROCESS_FORCEINLINE void assign(const offset_ptr<T2, DifferenceType, OffsetType, OffsetAlignment> &ptr, ipcdetail::bool_<false>) BOOST_NOEXCEPT
{ //we must convert to raw before calculating the offset
- this->internal.m_offset =
- static_cast<OffsetType>(ipcdetail::offset_ptr_to_offset(static_cast<PointedType*>(ptr.get()), this));
+ this->internal.m_offset = ipcdetail::offset_ptr_to_offset<OffsetType>(static_cast<PointedType*>(ptr.get()), this);
}
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
@@ -692,7 +706,7 @@ struct pointer_plus_bits<boost::interprocess::offset_ptr<T, P, O, A>, NumBits>
typedef boost::interprocess::offset_ptr<T, P, O, A> pointer;
//Bits are stored in the lower bits of the pointer except the LSB,
//because this bit is used to represent the null pointer.
- static const uintptr_t Mask = ((uintptr_t(1) << uintptr_t(NumBits)) - uintptr_t(1)) << uintptr_t(1);
+ static const O Mask = ((static_cast<O>(1) << NumBits) - static_cast<O>(1)) << 1;
BOOST_STATIC_ASSERT(0 ==(Mask&1));
//We must ALWAYS take argument "n" by reference as a copy of a null pointer
@@ -701,7 +715,7 @@ struct pointer_plus_bits<boost::interprocess::offset_ptr<T, P, O, A>, NumBits>
BOOST_INTERPROCESS_FORCEINLINE static pointer get_pointer(const pointer &n) BOOST_NOEXCEPT
{
pointer p;
- O const tmp_off = n.priv_offset() & O(~Mask);
+ O const tmp_off = n.priv_offset() & ~Mask;
p.priv_offset() = boost::interprocess::ipcdetail::offset_ptr_to_offset_from_other(&p, &n, tmp_off);
return p;
}
@@ -709,7 +723,7 @@ struct pointer_plus_bits<boost::interprocess::offset_ptr<T, P, O, A>, NumBits>
BOOST_INTERPROCESS_FORCEINLINE static void set_pointer(pointer &n, const pointer &p) BOOST_NOEXCEPT
{
BOOST_ASSERT(0 == (get_bits)(p));
- O const stored_bits = O(n.priv_offset() & Mask);
+ O const stored_bits = n.priv_offset() & Mask;
n = p;
n.priv_offset() |= stored_bits;
}
@@ -723,7 +737,7 @@ struct pointer_plus_bits<boost::interprocess::offset_ptr<T, P, O, A>, NumBits>
{
BOOST_ASSERT(b < (std::size_t(1) << NumBits));
O tmp = n.priv_offset();
- tmp &= O(~Mask);
+ tmp &= ~Mask;
tmp |= O(b << 1u);
n.priv_offset() = tmp;
}
generated by cgit v1.2.3 (git 2.25.1) at 2021-03-07 17:35:47 +0000