/*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* or throw an exception of the specified type.
*/
template <class E = std::out_of_range, class Map>
-typename Map::mapped_type get_or_throw(
- const Map& map, const typename Map::key_type& key,
+const typename Map::mapped_type& get_or_throw(
+ const Map& map,
+ const typename Map::key_type& key,
+ const std::string& exceptionStrPrefix = std::string()) {
+ auto pos = map.find(key);
+ if (pos != map.end()) {
+ return pos->second;
+ }
+ throw E(folly::to<std::string>(exceptionStrPrefix, key));
+}
+
+template <class E = std::out_of_range, class Map>
+typename Map::mapped_type& get_or_throw(
+ Map& map,
+ const typename Map::key_type& key,
const std::string& exceptionStrPrefix = std::string()) {
auto pos = map.find(key);
if (pos != map.end()) {
typename Func,
typename = typename std::enable_if<std::is_convertible<
typename std::result_of<Func()>::type,
- const typename Map::mapped_type&>::value>::type>
+ const typename Map::mapped_type&>::value>::type,
+ typename = typename std::enable_if<
+ std::is_reference<typename std::result_of<Func()>::type>::value>::type>
const typename Map::mapped_type& get_ref_default(
const Map& map,
const typename Map::key_type& key,