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Version 1.52.0:
Move constructors and move assignment operators added (only for compilers with C++11 rvalue references support). Original patch contributed by Antony Polukhin.
Version 1.37.0:
Improved the performance of Boost.Function's swap() operation for large function objects. Original patch contributed by Niels Dekker.
Added a new header <boost/function/function_typeof.hpp> that provides support for using the Boost.Typeof library on Boost.Function objects.
Added a new header <boost/function/function_fwd.hpp> that provides support for using the Boost.Typeof library on Boost.Function objects.
The target
()
function now respects the cv-qualifiers of function objects
stored by reference
(using boost::reference_wrapper
), such
that a reference to a const
function object cannot
be accessed as a reference to a non-const
function
object.
Version 1.36.0:
Boost.Function now implements allocator support
in the same way that is is provided in C++0x, based on C++
committee
proposal N2308. This
change removes the Allocator
template parameter of boost::function
in
favor of a constructor that takes an argument. While this is a
backward-incompatible change, it is likely to affect only a few
users. This change to Function was contributed by Emil
Dotchevski, which also authored the corresponding C++ committee
proposal.
Version 1.34.0:
Boost.Function now implements a small buffer optimization, which can drastically improve the performance when copying or construction Boost.Function objects storing small function objects. For instance, bind(&X:foo, &x, _1, _2)
requires no heap allocation when placed into a Boost.Function object. Note that some exception-safety guarantees have changed: assignment provides the basic exception guarantee and swap()
may throw.
Version 1.30.0:
All features deprecated in version 1.29.0 have been removed from Boost.Function.
boost::function
and boost::functionN
objects
can be assigned to 0 (semantically equivalent to calling
clear()
) and
compared against 0 (semantically equivalent to calling
empty()
).
The Boost.Function code is now generated
entirely by the Preprocessor library,
so it is now possible to generate
boost::function
and
boost::functionN
class
templates for any number of arguments.
The
boost::bad_function_call
exception class
was introduced.
Version 1.29.0: Boost.Function has been partially redesigned to minimize the interface and make it cleaner. Several seldom- or never-used features of the older Boost.Function have been deprecated and will be removed in the near future. Here is a list of features that have been deprecated, the likely impact of the deprecations, and how to adjust your code:
The boost::function
class template syntax has
changed. The old syntax, e.g., boost::function<int, float,
double, std::string>
, has been changed to a more natural
syntax boost::function<int (float, double,
std::string)>
, where all return and argument types are
encoded in a single function type parameter. Any other template
parameters (e.g., the Allocator
) follow this single
parameter.
The resolution to this change depends on the
abilities of your compiler: if your compiler supports template
partial specialization and can parse function types (most do), modify
your code to use the newer
syntax (preferable) or directly use one of the
functionN
classes whose syntax has not
changed. If your compiler does not support template partial
specialization or function types, you must take the latter option and
use the numbered Boost.Function classes. This option merely requires
changing types such as boost::function<void, int, int>
to boost::function2<void, int, int>
(adding the number of
function arguments to the end of the class name).
Support for the old syntax with the
boost::function
class template will persist for a short
while, but will eventually be removed so that we can provide better
error messages and link compatibility.
The invocation
policy template parameter (Policy
) has been deprecated
and will be removed. There is no direct equivalent to this rarely
used feature.
The mixin template parameter
(Mixin
) has been deprecated and will be removed. There
is not direct equivalent to this rarely used feature.
The
set
methods have been deprecated and will be
removed. Use the assignment operator instead.