X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/198b09ec16ca1b8fc05053bcae9e75c0ad689711..b32b5a8d04e1b7a68b68f947aa2cc4e7316ba0e6:/include/xbt/future.hpp

diff --git a/include/xbt/future.hpp b/include/xbt/future.hpp
index aa559db2a7..55abdc7db3 100644
--- a/include/xbt/future.hpp
+++ b/include/xbt/future.hpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2016. The SimGrid Team.
+/* Copyright (c) 2015-2017. The SimGrid Team.
  * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
@@ -9,20 +9,22 @@
 
 #include <cstddef>
 
-#include <utility>
 #include <exception>
+#include <functional>
 #include <stdexcept>
-
 #include <type_traits>
-
-
+#include <utility>
+#include <xbt/ex.h>
 
 namespace simgrid {
 namespace xbt {
 
-/** A value or an exception
+/** A value or an exception (or nothing)
  *
- *  The API is similar to the one of future and promise.
+ *  This is similar to `optional<expected<T>>`` but it with a Future/Promise
+ *  like API.
+ *
+ *  Also the name is not so great.
  **/
 template<class T>
 class Result {
@@ -32,7 +34,7 @@ class Result {
     exception,
   };
 public:
-  Result() {}
+  Result() { /* Nothing to do */}
   ~Result() { this->reset(); }
 
   // Copy (if T is copyable) and move:
@@ -46,12 +48,14 @@ public:
     switch (that.status_) {
       case ResultStatus::invalid:
         break;
-      case ResultStatus::valid:
+      case ResultStatus::value:
         new (&value_) T(that.value);
         break;
       case ResultStatus::exception:
         new (&exception_) T(that.exception);
         break;
+      default:
+        THROW_IMPOSSIBLE;
     }
     return *this;
   }
@@ -65,7 +69,7 @@ public:
     switch (that.status_) {
       case ResultStatus::invalid:
         break;
-      case ResultStatus::valid:
+      case ResultStatus::value:
         new (&value_) T(std::move(that.value));
         that.value.~T();
         break;
@@ -73,6 +77,8 @@ public:
         new (&exception_) T(std::move(that.exception));
         that.exception.~exception_ptr();
         break;
+      default:
+        THROW_IMPOSSIBLE;
     }
     that.status_ = ResultStatus::invalid;
     return *this;
@@ -93,6 +99,8 @@ public:
       case ResultStatus::exception:
         exception_.~exception_ptr();
         break;
+      default:
+        THROW_IMPOSSIBLE;
     }
     status_ = ResultStatus::invalid;
   }
@@ -117,14 +125,11 @@ public:
 
   /** Extract the value from the future
    *
-   *  After this the value is invalid.
+   *  After this, the value is invalid.
    **/
   T get()
   {
     switch (status_) {
-      case ResultStatus::invalid:
-      default:
-        throw std::logic_error("Invalid result");
       case ResultStatus::value: {
         T value = std::move(value_);
         value_.~T();
@@ -138,6 +143,8 @@ public:
         std::rethrow_exception(std::move(exception));
         break;
       }
+      default:
+        throw std::logic_error("Invalid result");
     }
   }
 private:
@@ -184,7 +191,7 @@ public:
  *  promise.set_value(code());
  *  </pre>
  *
- *  but it takes care of exceptions and works with void.
+ *  but it takes care of exceptions and works with `void`.
  *
  *  We might need this when working with generic code because
  *  the trivial implementation does not work with `void` (before C++1z).
@@ -217,7 +224,7 @@ auto fulfillPromise(P& promise, F&& code)
   }
 }
 
-/** Set a promise/result from a future/resul
+/** Set a promise/result from a future/result
  *
  *  Roughly this does:
  *