ISO C++
api
evolution
deprecation
history
API Evolution and Deprecation History
A list of user-visible changes, in chronological order
3.0
Extensions moved to include/ext.
Include files from the SGI/HP sources that pre-date the ISO standard
are added. These files are placed into
the include/backward directory and a deprecated warning
is added that notifies on inclusion (-Wno-deprecated
deactivates the warning.)
Deprecated include added.
Removal of include , , , , , , and .
3.1
Extensions from SGI/HP moved from namespace std
to namespace __gnu_cxx
. As part of this, the following
new includes are
added: , , , , and .
Extensions to basic_filebuf
introduced: __gnu_cxx::enc_filebuf
, and __gnu_cxx::stdio_filebuf
.
Extensions to tree data structures added in .
Removal of , moved to .
3.2
Symbol versioning introduced for shared library.
Removal of include .
Allocator changes. Change __malloc_alloc
to malloc_allocator
and __new_alloc
to new_allocator
.
For GCC releases from 2.95 through the 3.1 series, defining
__USE_MALLOC on the gcc command line would change the
default allocation strategy to instead use malloc
and
free. See
this note
for details as to why this was something needing improvement.
Error handling in iostreams cleaned up, made consistent.
3.3
3.4
Large file support.
Extensions for generic characters and char_traits
added in .
Support for wchar_t
specializations of basic_filebuf
enhanced to support UTF-8
and Unicode
, depending on host. More hosts support basic wchar_t
functionality.
Support for char_traits
beyond builtin types.
Conformant allocator
class and usage in containers. As
part of this, the following extensions are
added: , , , ,, .
This is a change from all previous versions, and may require
source-level changes due to allocator-related changes to structures
names and template parameters, filenames, and file locations. Some,
like __simple_alloc, __allocator, __alloc,
and
_Alloc_traits
have been removed.
Default behavior of std::allocator
has changed.
Previous versions prior to 3.4 cache allocations in a memory
pool, instead of passing through to call the global allocation
operators (i.e., __gnu_cxx::pool_allocator). More
recent versions default to the
simpler __gnu_cxx::new_allocator.
Previously, all allocators were written to the SGI
style, and all STL containers expected this interface. This
interface had a traits class called _Alloc_traits
that
attempted to provide more information for compile-time allocation
selection and optimization. This traits class had another allocator
wrapper, __simple_alloc<T,A>
, which was a
wrapper around another allocator, A, which itself is an allocator
for instances of T. But wait, there's more:
__allocator<T,A>
is another adapter. Many of
the provided allocator classes were SGI style: such classes can be
changed to a conforming interface with this wrapper:
__allocator<T, __alloc>
is thus the same as
allocator<T>
.
The class allocator used the typedef
__alloc to select an underlying allocator that
satisfied memory allocation requests. The selection of this
underlying allocator was not user-configurable.
Extension Allocators
Allocator (3.4)
Header (3.4)
Allocator (3.[0-3])
Header (3.[0-3])
__gnu_cxx::new_allocator<T>
std::__new_alloc
__gnu_cxx::malloc_allocator<T>
std::__malloc_alloc_template<int>
__gnu_cxx::debug_allocator<T>
std::debug_alloc<T>
__gnu_cxx::__pool_alloc<T>
std::__default_alloc_template<bool,int>
__gnu_cxx::__mt_alloc<T>
__gnu_cxx::bitmap_allocator<T>
Releases after gcc-3.4 have continued to add to the collection
of available allocators. All of these new allocators are
standard-style. The following table includes details, along with
the first released version of GCC that included the extension allocator.
Extension Allocators Continued
Allocator
Include
Version
__gnu_cxx::array_allocator<T>
4.0.0
__gnu_cxx::throw_allocator<T>
4.2.0
Debug mode first appears.
Precompiled header support PCH support.
Macro guard for changed, from _GLIBCPP_ to _GLIBCXX_.
Extension added.
Extension added.
4.0
TR1 features first appear.
Extension allocator added.
Extension codecvt
specializations moved to .
Removal of .
4.1
Removal of from all standard headers: now has to be explicitly included for std::assert
calls.
Extensions for policy-based data structures first added. New includes,
types, namespace pb_assoc
.
Extensions for typelists added in .
Extension for policy-based basic_string
first added: __gnu_cxx::__versa_string
in .
4.2
Default visibility attributes applied to namespace std
. Support for -fvisibility
.
TR1 , , and C compatibility headers added.
Extensions for concurrent programming consolidated
into and ,
including change of namespace to __gnu_cxx
in some
cases. Added types
include _Lock_policy
, __concurrence_lock_error
, __concurrence_unlock_error
, __mutex
, __scoped_lock
.
Extensions for type traits consolidated
into . Additional traits are added
(__conditional_type
, __enable_if
, others.)
Extensions for policy-based data structures revised. New includes,
types, namespace moved to __pb_ds
.
Extensions for debug mode modified: now nested in namespace
std::__debug
and extensions in namespace
__gnu_cxx::__debug
.
Extensions added:
and .
4.3
C++0X features first appear.
TR1 and 's mathematical special function added.
Backward include edit.
Removed
Added
and
Added in C++0x
and
Header dependency streamlining.
no longer includes , , or
no longer includes or , adds
no longer includes
no longer includes , , or , adds
no longer includes
no longer includes or
no longer includes or
no longer includes or
no longer includes
no longer includes or
Debug mode for and .
Parallel mode first appears.
Variadic template implementations of items in and
.
Default what
implementations give more elaborate
exception strings for bad_cast
,
bad_typeid
, bad_exception
, and
bad_alloc
.
PCH binary files no longer installed. Instead, the source files are installed.
Namespace pb_ds moved to __gnu_pb_ds.