minor

2020-03-02 18:53:20 -08:00
parent 44331decf9
commit bc8ecae8a0
1 changed files with 1 additions and 1 deletions
@@ -458,7 +458,7 @@ public:
    //! If possible, this value is cast to T and passed as the only argument
    //! of the provided function.
    template<typename T, typename FN>
-    void as(FN&& fn) {
+    void as(FN&& fn) const {
        typedef impl::StorageMap<typename std::decay<T>::type> map_t;
        typename map_t::store_t val;
        if(tryCopyOut(&val, map_t::code)) {