October 2009 - Boost - lists.preview.boost.org

Re: [boost] loglite - A logging library (JD)
by Tan, Tom (Shanghai) 01 Nov '09

01 Nov '09

> Please have a look and let me know what you think could be improved. The first thing I notice is that it does not support std::wstring directly. It's a big problem in my case I use wide-character in all my applications, which simplifies dealing with UTF-16 adopted by Modern Windows platforms. If I need to any string info from my program, I'll have to convert from UTF16(represented as std::wstring) to UTF8 so that it could be working well with LOGLITE. That's inconvenient. Offtopic, I … [View More]

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[ANN] CLI command line interface compiler for C++
by Boris Kolpackov 29 Oct '09

29 Oct '09

Hi, I am pleased to announce the first public release of CLI. CLI is an open-source (MIT license), cross-platform command line interface compiler for C++. It allows you to specify the options that your program supports, their types, and default values. For example: include <string>; class options { bool --help; std::string --name = "example"; unsigned int --level | -l = 5; }; This specification can then be automatically translated to C++ classes that implement parsing of the … [View More]

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Re: [boost] [Boost-users] at_thread_exit() never getting called
by vicente.botet 29 Oct '09

29 Oct '09

Hi, ----- Original Message ----- From: "cowwoc" <cowwoc(a)bbs.darktech.org> To: <boost-users(a)lists.boost.org> Sent: Wednesday, October 28, 2009 7:33 PM Subject: Re: [Boost-users] at_thread_exit() never getting called > > > I think https://svn.boost.org/trac/boost/ticket/2739 prevents it from > working. > > Gili > > > Steven Watanabe-4 wrote: >> >> AMDG >> >> cowwoc wrote: >>> I am registering boost::this_thread::… [View More]

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what is the interest of In Place factory
by rodrigue pons 29 Oct '09

29 Oct '09

Hello, I was looking about the boost In Place Factory to resolve a problem i got, and there is something i don't understand: what is the advantage of this lib? For example: I get a class A, wich constructor is: A( int, const string& ); And an another class, C, that contains an A*. C provides a method to construct this A*: void C::BuildA( int i, const string & str ); wich will be called this way: instance_of_C.BuildA( 1, "test" ); If now i use the boost In Place Factory, the … [View More]

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boost.math
by rodrigue pons 29 Oct '09

29 Oct '09

Hello, i need to implement the computation of huges series. These series are made of floats, and thus the error propagates. The problem is that the main constrain is the execution time, thus i must use the more "native" type possible. Is boost.math offer a solution to minimize this error? Which type of float (float, double, any structure?) must i use? Thanks.

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[spirit][regex] rxstrlit/regex_p with wchar_t strings
by Adam Badura 29 Oct '09

29 Oct '09

Is it possible to use rxstrlit/regex_p with wide character strings (wchar_t based)? Or even better, with arbitrary char type/char traits pair? I tried this with suggested example (http://www.boost.org/doc/libs/1_40_0/libs/spirit/classic/example/fundamenta…) and after converting to wchar_t what was required and compiling it run successfully. But it generated a lot of warnings about converting wchar_t to char in headers that looked like regex headers. So I guess it worked only because the … [View More]

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Why BOOST_HAS_DECLSPEC is not defined under MingW?
by Artyom 29 Oct '09

29 Oct '09

Hello, I've noticed following lines under boost/config/platform/win32.hpp #if !defined(__GNUC__) && !defined(BOOST_HAS_DECLSPEC) # define BOOST_HAS_DECLSPEC #endif Why? GCC provides support of declspec, Why it is specifically undefined? It can auto-export symbols but it does not work when static members involved. Thanks, Artyom

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Re: [boost] New boost packaging suggestion for windows
by Julian Bangert 29 Oct '09

29 Oct '09

Hello, > Sadly, the only point being discussed so far is the online registration. > What I find to be at least as annoying is the size of the package. And > by that I'm not (only) referring to the memory or bandwidth. The most > important issue is the burden of having to deal with such an amount of > data, even if I'm only interested into a relatively small part of boost. > My package contains everything in one archive. These 37MB offer quite good compression and you … [View More]

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[dbc] Interest in Design By Contract for C++?
by Lorenzo Caminiti 29 Oct '09

29 Oct '09

Hello all, Is there any interest in a library that supports Design By Contract (DBC) for C++? All DBC features of the Eiffel programming language are supported by this library, among others: 1) Optional compilation and runtime checking of preconditions, postconditions, and invariants. 2) Subcontracting for derived classes. 3) Use of "old" in postconditions. 4) Automatic contract documentation (integrated with doxygen or similar tools). EXAMPLE This is part of the Stack4 DBC example … [View More]presented for Eiffel in the book "Object Oriented Software Construction", B. Meyer, 1997. It has been coded for C++ using this library. #include <dbc.hpp> // This library. template<typename T> class Stack4 DBC_INHERIT_OBJECT(Stack4<T>) { public: Stack4(const int& n): capacity_(0), count_(0), representation_() DBC_CONSTRUCTOR( (private) (template)(Stack4)( (const int&) (n) ), { // Constructor preconditions. DBC_ASSERT(n >= 0, "non negative capacity"); }, { // Constructor postconditions. DBC_ASSERT(self.now.capacity() == n.now, "capacity set"); DBC_ASSERT(self.now.empty(), "is empty"); }, { // Constructor body. capacity_ = n; representation_.resize(capacity_); }) virtual ~Stack4() DBC_DESTRUCTOR( (public) (virtual) (template)(Stack4)(), { // Destructor body (do nothing). }) void remove() DBC_MEM_FUN( (public) (void) (template)DBC_COPYABLE(Stack4) (remove)(), { // Member function preconditions. DBC_ASSERT(!self.empty(), "not empty"); }, { // Member function postconditions. DBC_ASSERT(!self.now.full(), "not full"); DBC_ASSERT(self.now.count() == (self.old.count() - 1), "count decreased"); }, { // Member function body. --count_; }) ... // The rest of the Stack4 class. private: int capacity_; int count_; std::vector<T> representation_; DBC_INVARIANT(Stack4, { DBC_ASSERT(self.count() >= 0, "count non negative"); DBC_ASSERT_STREAM(self.count() <= self.capacity(), "count no greater than capacity", err << "count " << self.count() << " bounded by capacity " << self.capacity()); DBC_ASSERT( self.capacity() == int(self.representation_.capacity()), "capacity consistent with vector capacity"); DBC_ASSERT(self.empty() == (self.count() == 0), "empty when no elements"); if (self.count() > 0) DBC_ASSERT( self.representation_.at(self.count() - 1) == self.item(), "if positive count, item at top"); }) }; Example Notes: a) The somewhat strange syntax of the macro-based API (i.e., DBC_CONSTRUCTOR(), DBC_DESTRUCTOR(), and DBC_MEM_FUN()) uses a C++ preprocessor sequence of tokens "(public) (void) (template) ..." (this library internally uses Boost.Preprocessor to implement these macros). This library also provides a code-based API (dbc::fun::constr<>, dbc::fun::destr<>, and dbc::fun::mem<>) that can be used instead of the macro-based API but more setup code needs to be written by the programmers. b) This library also internally uses Boost.MPL mainly for typetraits, to support "old" in postconditions but only for types marked DBC_COPYABLE(), and for static assertions checking for library missuses (e.g., incorrect preprocessor sequence of tokens passed to the macro-based API). c) This library requires contracts to be written together with the class declaration (as contracts are part of the class specification). The class definition (function body) instead can either be written together with the contracts in the class declaration (like in the example above) or it can be written separately from the class declaration (i.e., this library maintains for function bodies the same C++ feature that allows to separate function's declaration and definition). Cheers, Lorenzo [View Less]

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[integer] Compilation failed in Visual Studio
by Adam Badura 28 Oct '09

28 Oct '09

Following simple program: #include <boost/integer_fwd.hpp> int main() { return 0; } does not compile in Visual Studio 2008 with Boost 1.40.0. Compilation errors are following: 1>d:\libraries\boost_1_40_0\boost\integer_fwd.hpp(70) : error C2039: 'long_long_type' : is not a member of 'boost' 1>d:\libraries\boost_1_40_0\boost\integer_fwd.hpp(70) : error C2065: 'long_long_type' : undeclared identifier 1>d:\libraries\boost_1_40_0\boost\integer_fwd.hpp(70) : error C2913: … [View More]

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