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  * Exception storage
  32  */
  33 class storage
  34 {
  35 public:
  36 /**
  37  * Null object.
  38  */
  39         storage();
  40 /**
  41  * Store an exception.
  42  *
  43  * Parameter e: The exception.
  44  */
  45         storage(std::exception& e);
  46 /**
  47  * Rethrow the exception.
  48  */
  49         void rethrow();
  50 /**
  51  * Is anything here?
  52  */
  53         operator bool();
  54 private:
  55         bool null;
  56         bool oom;
  57         std::function<void()> do_rethrow;
  58 };
  59 }
  60
  61 #endif