History & Compatibility Notes
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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.
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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.
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Version 1.30.0:
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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:
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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.
Last revised: July 14, 2008 at 14:32:29 -0400 |
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