ceph/src/boost/libs/gil/include/boost/gil/extension/io/io_error.hpp

   1 /*
   2     Copyright 2005-2007 Adobe Systems Incorporated
   3
   4     Use, modification and distribution are subject to the Boost Software License,
   5     Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6     http://www.boost.org/LICENSE_1_0.txt).
   7
   8     See http://opensource.adobe.com/gil for most recent version including documentation.
   9 */
  10 /*************************************************************************************************/
  11
  12 #ifndef GIL_IO_ERROR_H
  13 #define GIL_IO_ERROR_H
  14
  15 /// \file
  16 /// \brief  Handle input-output errors
  17 /// \author Lubomir Bourdev and Hailin Jin \n
  18 ///         Adobe Systems Incorporated
  19 /// \date   2005-2007 \n  Last updated on May 30, 2006
  20
  21 #include <ios>
  22 #include "../../gil_config.hpp"
  23 #include <boost/shared_ptr.hpp>
  24
  25 namespace boost { namespace gil {
  26
  27 inline void io_error(const char* descr) { throw std::ios_base::failure(descr); }
  28 inline void io_error_if(bool expr, const char* descr="") { if (expr) io_error(descr); }
  29
  30 namespace detail {
  31     class file_mgr {
  32     protected:
  33         shared_ptr<FILE> _fp;
  34
  35         struct null_deleter { void operator()(void const*) const {} };
  36         file_mgr(FILE* file) : _fp(file, null_deleter()) {}
  37
  38         file_mgr(const char* filename, const char* flags) {
  39             FILE* fp;
  40             io_error_if((fp=fopen(filename,flags))==NULL, "file_mgr: failed to open file");
  41             _fp=shared_ptr<FILE>(fp,fclose);
  42         }
  43
  44     public:
  45         FILE* get() { return _fp.get(); }
  46     };
  47 }
  48
  49 } }  // namespace boost::gil
  50
  51 #endif