/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
public:
static_assert(!std::is_reference<Value>::value,
"Optional may not be used with reference types");
+ static_assert(!std::is_abstract<Value>::value,
+ "Optional may not be used with abstract types");
Optional()
: hasValue_(false) {