diff options
| -rw-r--r-- | butl/optional | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/butl/optional b/butl/optional index 308302e..00c204a 100644 --- a/butl/optional +++ b/butl/optional @@ -40,6 +40,20 @@ namespace butl T value_; bool null_; }; + + template <typename T> + inline auto + operator== (const optional<T>& x, const optional<T>& y) -> decltype (*x == *y) + { + return static_cast<bool> (x) == static_cast<bool> (y) && (!x || *x == *y); + } + + template <typename T> + inline auto + operator!= (const optional<T>& x, const optional<T>& y) -> decltype (x == y) + { + return !(x == y); + } } #endif // BUTL_OPTIONAL |