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Interfaces Library, a macro less implementation
by Joel de Guzman 05 Jul '05

05 Jul '05

Hi, I like the idea behind the Interfaces Library: http://www.kangaroologic.com/interfaces/ I need one now. I dislike the macro-based Interface Definition Language, however. I find it utterly ugly especially because interfaces should be immediately readable. IMO, the macro-based IDL is not. Here's another take (prototype) at a macro less implementation of the interfaces (see attached). Tested on VC7.1, g++ and Comeau. The biggest advantage is that the same C++ member function interface syntax is retained. This makes it very easy to understand and even allows documentation extraction tools like Doxygen to work as usual. A disadvantage is that there is some unavoidable redundancy-- a lesser price to pay, IMO. Here's a client side example: struct foo : member_function<int(int)> {}; struct bar : member_function<int(char const*)> {}; // a baz "interface" class baz : interface<foo, bar> { public: template <class T> baz(T& x) : construct(x) {} int foo(int x) { return this->call< ::foo>(x); } int bar(char const* x) { return this->call< ::bar>(x); } }; struct some_baz { int impl(foo, int x) { return x + 1; } int impl(bar, char const* s) { return std::strlen(s); } }; struct another_baz { int impl(foo, int x) { return x - 1; } int impl(bar, char const* s) { return -std::strlen(s); } }; int main() { some_baz f; baz p = f; std::cout << "p.foo(3) = " << p.foo(3) << std::endl; std::cout << "p.bar(\"hi\") = " << p.bar("hi") << std::endl; another_baz f2; p = f2; std::cout << "p.foo(3) = " << p.foo(3) << std::endl; std::cout << "p.bar(\"hi\") = " << p.bar("hi") << std::endl; } Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net #include <iostream> #include <string> #include <cstring> #include <boost/spirit/fusion/sequence/tuple.hpp> #include <boost/spirit/fusion/sequence/at.hpp> using namespace boost::fusion; template <class Sig> struct member_function; template <class RT, class A0> struct member_function<RT(A0)> { typedef RT return_type; typedef A0 arg0_type; typedef RT(*pointer_type)(void*, A0); }; template <class F0, class F1> struct interface { typedef tuple< typename F0::pointer_type , typename F1::pointer_type> vtable_type; template <class T> struct functions { template <typename F> struct forward { typedef typename F::return_type return_type; typedef typename F::arg0_type arg0_type; static return_type call(void* p, arg0_type x) { return static_cast<T*>(p)->impl(F(), x); } }; static typename interface<F0, F1>::vtable_type const* table() { static typename interface<F0, F1>::vtable_type vtable( &forward<F0>::call , &forward<F1>::call); return &vtable; // a singleton } }; template <class T> interface(T& x) : vtable(functions<T>::table()) , obj(&x) {} typedef interface<F0, F1> construct; typename boost::fusion::meta::at_c<vtable_type const, 0>::type find(F0) const { return boost::fusion::at<0>(*vtable); } typename boost::fusion::meta::at_c<vtable_type const, 1>::type find(F1) const { return boost::fusion::at<1>(*vtable); } template <typename F> typename F::return_type call(typename F::arg0_type x) { return find(F())(const_cast<void*>(obj), x); } vtable_type const* vtable; void const* obj; }; /////////////////////////////////////////////////////////////// // // Client Code // /////////////////////////////////////////////////////////////// struct foo : member_function<int(int)> {}; struct bar : member_function<int(char const*)> {}; // a baz "interface" class baz : interface<foo, bar> { public: template <class T> baz(T& x) : construct(x) {} int foo(int x) { return this->call< ::foo>(x); } int bar(char const* x) { return this->call< ::bar>(x); } }; struct some_baz { int impl(foo, int x) { return x + 1; } int impl(bar, char const* s) { return std::strlen(s); } }; struct another_baz { int impl(foo, int x) { return x - 1; } int impl(bar, char const* s) { return -std::strlen(s); } }; int main() { some_baz f; baz p = f; std::cout << "p.foo(3) = " << p.foo(3) << std::endl; std::cout << "p.bar(\"hi\") = " << p.bar("hi") << std::endl; another_baz f2; p = f2; std::cout << "p.foo(3) = " << p.foo(3) << std::endl; std::cout << "p.bar(\"hi\") = " << p.bar("hi") << std::endl; }

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Co-author?
by David Abrahams 05 Jul '05

05 Jul '05

Hi Eric, I'm thinking that somebody who knows what users need has to write the Boost books. I'm a little wary of co-authoring again, but I have a lot of confidence in your ability to communicate and have been thinking of asking you about it for some time. I know you're on vacation, but I see you're still active on the lists, so I thought I'd plant the seed of the idea and see what grows there. So, what do you think about writing a series of books on Boost? -- Dave Abrahams Boost Consulting www.boost-consulting.com

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Re: [boost] static assert
by Philippe Mori 04 Jul '05

04 Jul '05

> Even though I'm surely not the first one that came up to this, I've got a > feature suggestion for the Static Assert library. > > It would probably be nice to have a variation of the macro that has a second > argument with a short description of the problem that caused the assertion. > > > For example: > > ... > #elif defined(BOOST_MSVC) > #define BOOST_STATIC_ASSERT2( B, explanation ) \ > typedef ::boost::static_assert_test<\ > sizeof(::boost::BOOST_JOIN(STATIC_ASSERTION_FAILURE__, explanation)< (bool)( > B ) >)>\ > BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__) > ... > > static_assert(2 > 3, two_not_larger_than_three); > > error C2039: 'STATIC_ASSERTION_FAILURE__two_not_larger_than_three' : is not a > member of 'boost' > > > > Comments? > > Well, I tend to prefer a solution in the line of : STATIC_ASSERT_GT(2, 3); My implementation is based on conversion on template classes : template <long> struct Value { }; template <long p1, long p2, bool p3> struct ValueCond { }; #define STATIC_ASSERT_EQUAL(a, b) \ Value<(a)>(((void)0, Value<(b)>())) #define STATIC_ASSERT_GREATER(a, b) \ ValueCond<(a), (b), ((a) > (b))> \ (((void)0, ValueCond<(a), (b), true>())) Well, this solution needs some improvments : 1) Ensure it works on most compiler. It works with Visual C++ 7.1 and CodeWarrior for Palm 9.03. 2) Ensure that error message is meaningfull or try to find alternate solution for that compiler. 3) Make it BOOST compliant 4) Make it works with larger integers. Part of the solution is using the biggest integers availables at compile-time but it does still restrict the range of checks (it won't works for very big unsigned numbers). It should be done generally so that the user won't have to uses differents set of amcros for big unsignbed number as this would require the user to know the type of every constants he wants to check. In practice, this is not often a big constraint as we can always uses existing assertions for special cases and also because most check are relatively small number (for example, checking the size of a buffer). Philippe

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static assert
by Goran Mitrovic 04 Jul '05

04 Jul '05

Even though I'm surely not the first one that came up to this, I've got a feature suggestion for the Static Assert library. It would probably be nice to have a variation of the macro that has a second argument with a short description of the problem that caused the assertion. For example: ... #elif defined(BOOST_MSVC) #define BOOST_STATIC_ASSERT2( B, explanation ) \ typedef ::boost::static_assert_test<\ sizeof(::boost::BOOST_JOIN(STATIC_ASSERTION_FAILURE__, explanation)< (bool)( B ) >)>\ BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__) ... static_assert(2 > 3, two_not_larger_than_three); error C2039: 'STATIC_ASSERTION_FAILURE__two_not_larger_than_three' : is not a member of 'boost' Comments? P.S. With the usage of __VA_ARGS__, an implementation that would allow, with some programmer's discipline, both forms merged together might be done!

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[ANN] xpressive 0.9.3 in boost-sandbox
by Eric Niebler 04 Jul '05

04 Jul '05

<< Background >> xpressive is a TR1 regex work-alike that also accepts regexes as expression templates and lets regexes nest and call each other recursively. << Significant changes since 0.9.2 >> - TR1-style regex_traits interface - Speed enhancements - syntax_option_type::ignore_white_space << Download >> xpressive.zip at: http://boost-sandbox.sf.net/vault/index.php?directory=eric_niebler << Docs >> http://boost-sandbox.sf.net/libs/xpressive -- Eric Niebler Boost Consulting www.boost-consulting.com

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[Serialization] base_object.hpp fix
by Douglas Gregor 04 Jul '05

04 Jul '05

I've checked in the following patch, which fixes several multi_index tests on the OSL machines. Doug > > Index: base_object.hpp > =================================================================== > RCS file: /cvsroot/boost/boost/boost/serialization/base_object.hpp,v > retrieving revision 1.12 > retrieving revision 1.13 > diff -u -d -r1.12 -r1.13 > --- base_object.hpp 4 Jul 2005 05:32:13 -0000 1.12 > +++ base_object.hpp 4 Jul 2005 18:18:20 -0000 1.13 > @@ -39,7 +39,7 @@ > > #if ! defined(BOOST_ARCHIVE_BASIC_ARCHIVE_HPP) > template<class Derived, class Base> > - const void_caster & void_cast_register( > + void void_cast_register( > const Derived * /* dnull = NULL */, > const Base * /* bnull = NULL */ > );

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Re: [boost] Refering to Boost.Build in print
by Bjorn.Karlsson＠readsoft.com 04 Jul '05

04 Jul '05

> From: Jonathan Turkanis [mailto:technews@kangaroologic.com] > > > > I guess the most consistent thing would be to capitalize "Build" and > > leave the rest as you have written it. > > Really? To me it seems a bit odd to treat the works "build" > and "system" > differently, when they are both components on the term "build > system." My > instinct would have been to use either "Boost Build System" > or "Boost build > system." I think that "the Boost build system" is correct. There's no need to apply rules for [writing about] Boost library names to the term "build system". Bjorn

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Re: [boost] Regressions in your Boost libraries as of 2005-07-02
by David Abrahams 03 Jul '05

03 Jul '05

Douglas Gregor <dgregor(a)cs.indiana.edu> writes: > You are receiving this report because one or more of the libraries you > maintain has regression test failures that are not accounted for. > A full version of the report is sent to the Boost developer's mailing > list. > > Detailed report: > http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/issues… > > There are failures in these libraries you maintain: > python (4) > > |python| > extract: gcc-3.3.6-linux > list: gcc-3.3.6-linux > operators: gcc-3.3.6-linux > slice: gcc-3.3.6-linux Doug, this surprises me, since I tested Boost.Python on the machine you indicated and all tests passed. Did you adjust the toolset in the way I indicated was necessary? -- Dave Abrahams Boost Consulting www.boost-consulting.com

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more/separate_compilation.html
by David Abrahams 03 Jul '05

03 Jul '05

in http://boost-consulting.com/boost/more/separate_compilation.html (wow, I didn't know we had this file!) there are many mentions of the "common names" rule in the comments (which I assume should be "common-names") but no usages of it -- instead there are many instances of common-variant. That doesn't seem quite right. -- Dave Abrahams Boost Consulting www.boost-consulting.com

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Boost regression notification (2005-07-03)
by Douglas Gregor 03 Jul '05

03 Jul '05

Boost regression test failures ------------------------------ Report time: 2005-07-03T15:28:23Z This report lists all regression test failures on release platforms. WARNING: The following libraries have failing regression tests but do not have a maintainer on file. Once a maintainer is found, add an entry to libs/maintainers.txt to eliminate this message. random preprocessor io Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/issues… 279 failures in 12 libraries: date_time (1) graph (2) io (2) numeric/ublas (6) preprocessor (1) program_options (12) random (3) serialization (235) spirit (6) test (6) thread (1) wave (4) |date_time| testlocal_time_input_facet: cw-9_4 |graph| astar_search_test: vc-8_0 graphviz_test: intel-win32-8_1 |io| ios_state_unit_test: intel-win32-8_1 intel-win32-8_1 |numeric/ublas| test1: cw-9_4 intel-win32-8_1 test3: cw-9_4 test4: cw-9_4 test5: cw-9_4 test6: cw-9_4 |preprocessor| seq: cw-8_3 |program_options| cmdline_test: vc-7_0 cmdline_test_dll: mingw-3_4_2 vc-7_0 parsers_test: vc-7_0 parsers_test_dll: vc-7_0 positional_options_test_dll: mingw-3_4_2 unicode_test: vc-7_0 unicode_test_dll: cw-9_5-darwin gcc-3_3-darwin vc-7_0 variable_map_test: vc-7_0 variable_map_test_dll: vc-7_0 |random| 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test_split_text_warchive_dll: cw-9_5-darwin test_split_xml_warchive_dll: cw-9_5-darwin test_tracking_text_archive_dll: cw-9_5-darwin test_tracking_text_warchive_dll: cw-9_5-darwin test_tracking_xml_warchive_dll: cw-9_5-darwin test_variant_text_archive_dll: cw-9_5-darwin test_variant_text_warchive_dll: cw-9_5-darwin test_variant_xml_archive_dll: cw-9_5-darwin test_variant_xml_warchive_dll: cw-9_5-darwin test_vector_text_archive_dll: cw-9_5-darwin test_vector_text_warchive_dll: cw-9_5-darwin test_vector_xml_archive_dll: cw-9_5-darwin test_vector_xml_warchive_dll: cw-9_5-darwin |spirit| bug_fixes: cw-9_5-darwin bug_fixes_debug: cw-9_5-darwin numerics_tests: gcc-3.2.3-linux numerics_tests_debug: gcc-3.2.3-linux owi_mt_tests: cw-9_4 gcc-3_3-darwin |test| errors_handling_test: cw-9_5-darwin vc-8_0 test_fp_comparisons: borland-5_6_4 test_tools_test: cw-9_4 cw-9_4 cw-9_5-darwin |thread| test_read_write_mutex: borland-5_6_4 |wave| testwave: cw-8_3 cw-9_5-darwin gcc-3.2.3-linux gcc-3.3.6-linux

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