include/library/exrethrow.hpp

   1 #ifndef _library__exrethrow__hpp__included__
   2 #define _library__exrethrow__hpp__included__
   3
   4 #include <stdexcept>
   5 #include <functional>
   6
   7 namespace exrethrow
   8 {
   9 /**
  10  * Add a exception type.
  11  */
  12 void add_ex_spec(unsigned prio, std::function<bool(std::exception& e)> identify,
  13         std::function<void()> (*throwfn)(std::exception& e));
  14 std::function<void()> get_throw_fn(std::exception& e);
  15
  16 /**
  17  * Exception type specifier.
  18  */
  19 template<typename T, unsigned prio> class ex_spec
  20 {
  21 public:
  22         ex_spec()
  23         {
  24                 add_ex_spec(prio, [](std::exception& e) -> bool { return (dynamic_cast<T*>(&e) != NULL); },
  25                         [](std::exception& e) -> std::function<void()>  { T _ex = *dynamic_cast<T*>(&e);
  26                         return [_ex]() -> void { throw _ex; }; });
  27
  28         }
  29 };
  30
  31 /**
  32  * Exception storage
  33  */
  34 class storage
  35 {
  36 public:
  37 /**
  38  * Null object.
  39  */
  40         storage();
  41 /**
  42  * Store an exception.
  43  *
  44  * Parameter e: The exception.
  45  */
  46         storage(std::exception& e);
  47 /**
  48  * Rethrow the exception.
  49  */
  50         void rethrow();
  51 /**
  52  * Is anything here?
  53  */
  54         operator bool();
  55 private:
  56         bool null;
  57         bool oom;
  58         std::function<void()> do_rethrow;
  59 };
  60 }
  61
  62 #endif