November 2006 - Boost-users - lists.preview.boost.org

boost filesystem
by Aubrey, Jason 01 Nov '06

01 Nov '06

Hi, When I run the following program it runs successfully but throws an exception during shutdown. I don't know why, but it seems that the call to boost::filesystem::file_size() is corrupting memory somehow. This example only shows the call to file_size() but I think I've seen similar trouble with other calls within boost::filesystem. Am I doing something wrong here or is this a bug? Regards, Jason Aubrey ---------------------- Environment: OS: Win2k Compiler: VS7.1 Boost: v1.33.1 ---------------------- #include <boost/filesystem/operations.hpp> #include <fstream> int main(int, char**) { // Create a file using namespace std; const string fileName("/temp/test.txt"); ofstream file; file.open(fileName.c_str()); const string message("this is a test"); file << message; file.close(); const boost::intmax_t fileSize = boost::filesystem::file_size(fileName); if( fileSize != message.size() ) throw std::exception("Bad result"); return 0; } ---------------------- The following pop-up occurs during program completion: Window Title="Microsoft Visual C++ Debug Library" Window Icon=Critical Error Window Text=" Debug Assertion Failed! Program: .... File: dbgdel.cpp Line: 52 Expression: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse) For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts. (Press Retry to debug the application)" Buttons=[Abort] [Retry] [Ignore]

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Error when build boost using GCC on AIX, "stdint.h not exist"
by kongko kongko 01 Nov '06

01 Nov '06

Hi,I want to install boost 1.33.1 on PowerPC AIX 5.1,my complier is GCC 4.0.1. This error occure: "/boost_1_33_1/boost/cstdint.hpp:42:23: error: stdint.h: A file or directory in the path name does not exist." I have can't find stdint.h in my system,Does anybody has the same problem?How can i solve it ? Thanks a lot. _________________________________________________________________ 免费下载 MSN Explorer: http://explorer.msn.com/lccn/

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Re: [Boost-users] [Boost.Parameter] How to Use Named Parameters in a Class Hierarchy?
by james.jones＠firstinvestors.com 01 Nov '06

01 Nov '06

From: "Wu Yinghui, Freddie" <yhwu(a)volumeinteractions.com> > To use the class hierarchy, my program loads the DLL requested by user > using LoadLibrary() (We're using Windows, but it should be similar to > Linux, I suppose), and makes use of the Derived1/Derived2 classes via a > pointer to the Base class. > > Since I have no information about the derived classes when building my > main executable (only Base class is known then), I cannot make direct > use of Derived1/Derived2 types in my main program. -- Yet, I need a way > to provide some arbitrary set of arguments to the derived classes. > > Hope my explanation clears your doubts. Do you have any suggestion or > alternative design in mind? Try a single boost::any parameter. Then pass structures as needed. This is essentially equivalent to the void* method everyone used in the bad old pre-Boost days, but it's type-safe. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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