Return a modifiable reference to the mapped value for key.
Synopsis
Declared in <bslstl_unorderedmap.h>
add_lvalue_reference<VALUE>::type
operator[](key_type const& key);Description
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}).
Return Value
modifiable reference to the mapped value
Parameters
Name |
Description |
key |
key to look up |
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