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Below are the changes for the current release.
See the CHANGES file for changes in older releases.
See the RELEASENOTES file for a summary of changes in each release.
Issue # numbers mentioned below can be found on Github. For more details, add
the issue number to the end of the URL: https://github.com/swig/swig/issues/
Version 4.2.0 (in progress)
===========================
2022-12-03: wsfulton
#1715 Fix syntax error parsing of unconventionally placed Doxygen post
comments for enum items.
2022-12-02: wsfulton
#624 #1021 Improved template template parameters support. Previously, specifying more
than one simple template template parameter resulted in a parse error. Now
multiple template template parameters are working including instantiation with
%template. Example:
template <template<template<class> class, class> class Op, template<class> class X, class Y>
class C { ... };
2022-11-26: wsfulton
#1589 #1590 Slightly better decltype() support for expressions, such as:
int i,j;
... decltype(i+j) ...
... decltype(&i) ...
These result in a warning for non-trivial expressions which SWIG cannot evaluate:
Warning 344: Unable to deduce decltype for 'i+j'.
See 'Type Inference' in CPlusPlus.html for workarounds.
2022-11-22: wsfulton
#1037 Fix seg fault handling template parameter expressions containing '<='
or '>='.
2022-11-18: wsfulton
Duplicate class template instantiations via %template now issue a warning and are ignored.
%template(Aint) A<int>;
%template(Aint2) A<int>; // Now ignored and issues a warning
example.i:7: Warning 404: Duplicate template instantiation of 'A< int >' with name 'Aint2' ignored,
example.i:6: Warning 404: previous instantiation of 'A< int >' with name 'Aint'.
A single empty template instantiation before a named instantiation is the one exception
for allowing duplicate template instantiations as the empty template instantation does not
create a wrapper for the template, it merely adds the instantiation into SWIG's internal
type system.
Duplicate empty template instantiations are quietly ignored.
%template() B<int>;
%template(Bint) B<int>; // OK
%template() C<int>;
%template() C<int>; // Quietly ignored now
%template(Cint) C<int>; // OK
Note that default template parameters are considered when looking for duplicates such as:
template <typename T, typename U = short> struct D {};
%template(Dint) D<int>;
%template(Dintshort) D<int, short>;
example.i:7: Warning 404: Duplicate template instantiation of 'D< int,short >' with name 'Dintshort' ignored,
example.i:6: Warning 404: previous instantiation of 'D< int >' with name 'Dint'.
Note that the following always was ignored, but that was because the chosen name was a
duplicate rather than the template being a duplicate:
%template(Eint) E<int>;
%template(Eint) E<int>; // Always has been ignored as a redefined identifier
The old warning was:
example.i:7: Warning 302: Identifier 'Eint' redefined (ignored) (Renamed from 'E< int >'),
example.i:6: Warning 302: previous definition of 'Eint' (Renamed from 'E< int >').
*** POTENTIAL INCOMPATIBILITY ***
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