- Boost - lists.boost.org

Re: [boost] Re: BOOST_TRY like macros: time to add them?
by JOAQUIN LOPEZ MU?Z 11 Mar '04

11 Mar '04

----- Mensaje original ----- De: Gennaro Prota <gennaro_prota(a)yahoo.com> Fecha: Jueves, Marzo 11, 2004 8:36 pm Asunto: [boost] Re: BOOST_TRY like macros: time to add them? > On Thu, 11 Mar 2004 12:21:09 -0500, David Abrahams > <dave(a)boost-consulting.com> wrote: > > >I think if you review this thread you'll see that there's no > argument. > No argument in favor of the macros? Yes, I see that. [...] Now I'm lost. Are you saying try-catch-rethrow macros for coping with BOOST_NO_EXCEPTIONS along the line proposed by Pavel are not good? Why not? Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

1 0

[indexed_set] volunteers wanted for testing
by Joaquín Mª López Muñoz 11 Mar '04

11 Mar '04

Review for indexed_set will take place in a couple of weeks; I'd like to ask for volunteers who want to try the tests on their compilers/platforms to make sure it works on a reasonable number of them. Current version has been tested for MSVC++ 6.0 SP5, ICC++ 7.1 and GCC 3.3.1 (cygwin). In particular, I'm interested in ICC+ 8.0 and MSVC 7.1, where prior versions of the library were tested without problems. Last version of the library (9.2) available at http://groups.yahoo.com/group/boost/files/indexed_set.zip Thank you in advance. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

6 10

[filesystem] create_directory() & create_directories() return bool
by Beman Dawes 11 Mar '04

11 Mar '04

create_directory() no longer throws if the directory already exists. create_directory() and create_directories() now return a bool indicating if a directory was actually created. Both throw if the path argument exists and is not a directory. Docs and test cases updated accordingly. --Beman

1 0

[Signals] Added disconnect() based on function object equivalence
by Douglas Gregor 11 Mar '04

11 Mar '04

Since we're discussing the issue, I've added an experimental disconnect() member function to signals that allows one to disconnect equivalent slots, e.g., void foo(); void bar(); signal<void()> sig; sig.connect(&foo); sig.connect(&bar); sig.disconnect(&foo); // disconnects foo, but not bar We could also reconsider the += and -= syntax, since support for -= now makes some sense. Doug

2 1

iterator adaptors problem
by Pavol Droba 10 Mar '04

10 Mar '04

Hi, I have a problem with iterator_facade usage. Error is reported by Comeau and MIPSPro compilers: An error output can be found in regression tables: http://tinyurl.com/37mxz The compiler is reporting, that iterator_core_access cannot access the private equal() function, althought it has been marked as friend. My iterator class is publicaly derived from iterator_facade and privately from another templated class. Is it possible, that multiple inheritance creates the problem? Thanks for any help. Pavol

3 6

lambda BLL question
by Neal D. Becker 10 Mar '04

10 Mar '04

I was just trying out lambda and I have a question. I have a template class Ave template<typename in_t, typename Scale> struct Ave {...} It takes a function type argument "Scale". Here's a test: typedef typeof (_1 * 0.1) some_type; some_type func (_1 * 0.1); // Ave<double, typeof (_1 * 0.1)> ave (_1 * 0.1); << this will work Ave<double, some_type> ave (func); << this will also What is the preferred way to do this without "typeof"? How do I get the type returned by the lambda expression to feed to the template Ave?

2 1

[filesystem] create_directories not thread-safe?
by Vladimir Prus 10 Mar '04

10 Mar '04

I have an application which sometimes fails saying that it can't create a directory, because it already exists. The directory is created by fs::create_directories("run"); and the application is multi-threaded. It seems there's a race condition: if (ph.empty() || exists(ph)) return; // First create branch, by calling ourself recursively create_directories(ph.branch_path()); // Now that parent's path exists, create the directory create_directory(ph); After one thread checks that 'ph' does not exist, another one creates the same directory, so call to 'create_directory' fails. What can be done? Basically, adding a mutex for MT build and adding a warning to docs are the variants. Opinions? - Volodya

7 11

Re:[boost] Re: [serialization17] demo_fast_binary_archive.cpp CANNOT compile in gcc 3.3.3
by Robert Ramey 10 Mar '04

10 Mar '04

David Abrahams wrote: >"Allen Yao" <yaozhen(a)ustc.edu> writes: >> It seems that gcc does not allow this kind of template argument deduction: >> >> template <int N> >> void f(int a[N]) >> { >> for (int i = 0; i < N; i++) >> cout << a[i] << " "; >> cout << endl; >> } >> >> int main() >> { >> int a[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; >> >> f(a); >> } >> >> The error message is: >> >> error: no matching function for call to `f(int[10])' > >> I would like to know how to fix this. Is there any workaround? >> Or if I am missing something? >You're missing something. Your declaration of f is equivalent to: > template <int N> > void f(int* a); >try: > template <int N> > void f(int a(&)[N]) ^^^ >instead. Hmm - that didn't work for me. But with the above hint I made the following compile and function with both VC 7.1 and gcc. template <int N> void f(int (& a)[N]) ^^^^ I had never been able to get demo_fast_binary_archive but could never figure out the reason - Mystery Solved ! Robert Ramey

2 1

another compilation problem
by Pavol Droba 10 Mar '04

10 Mar '04

Hi, I have another compilation problem, that I could use some help with. When I try to compile libs/algorithm/string/test/replace_test.cpp with gcc3.3.1 in release mode, it fails on out-of-memory error after allocating more then 400MB of memory. Older version of compiler were able to compile it, but it took something like an hour on 1Ghz Pentium III machine (As comparison, it takes just 2 minutes with vc7.1). I thought that it is just a bug in gcc optimization, but now it seems, that intel 8.0 has also similar problems. http://tinyurl.com/vbrx#algorithm/string-replace-intel-8.0-linux Have somebody encountered the similar problem? Thanks for help, Pavol

1 0

AIX vacpp question
by Pavol Droba 10 Mar '04

10 Mar '04

Hi, VACPP compiler is failing one of the test cases of the string_algo library. http://boost.sourceforge.net/regression-logs/cs-AIX-links.html#algorithm-re… It is the check for sequence traits. It seem, that trait classes did not get instantiated. Is there something special that this compiler needs, to avoid this problem? Other compilers do not seem to have a problem. It is not possible to instantiate all trait explicitly, because the template paramteres are mostly template again. I might have forgotten something, that other compilers just ignore. Can anybody give me some hints? Thanks, Pavol.

5 10