Subscript operators
Declared in <bslstl_unorderedmap.h>
Return a reference providing modifiable access to the mapped-value associated with the specified key in this unordered map; if this unordered map does not already contain a value_type object with key, first insert a new value_type object having key and a default-constructed VALUE object. Note that this method requires that the (template parameter) VALUE is "default-constructible" (see {Requirements on value_type}). Note that key may be modified; it is guaranteed to be left in a valid state.
add_lvalue_reference<VALUE>::type
operator[](BloombergLP::bslmf::MovableRef<key_type> key);Return a reference providing modifiable access to the mapped-value associated with the specified key in this unordered map; if this unordered map does not already contain a value_type object with key, first insert a new value_type object having key and a default-constructed VALUE object. Note that this method requires that the (template parameter) type KEY is copy-constructible and the (template parameter) VALUE is "default-constructible" (see {Requirements on value_type}).
add_lvalue_reference<VALUE>::type
operator[](key_type const& key);Return a reference providing modifiable access to the mapped-value associated with a key that is equivalent with the specified key; if this map does not already contain a value_type object having an equivalent key, first insert a new value_type object having the move-inserted key and a default-constructed VALUE object, and return a reference to the newly mapped (default) value. This method requires that the (template parameter) type KEY be move-insertable into this map and the (template parameter) type VALUE be default-insertable into this map (see {Requirements on KEY and VALUE}).
template<class LOOKUP_KEY>
add_lvalue_reference<VALUE>::type
operator[](LOOKUP_KEY&& key)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
&& BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;