Return a const reference to the mapped value for key.
Declared in <bslstl_map.h>
add_lvalue_reference<VALUE const>::type
at(key_type const& key) const;Return a reference providing non-modifiable access to the mapped-value associated with a key that is equivalent to the specified key, if such an entry exists; otherwise, throw a std::out_of_range exception. Note that this method may also throw a different kind of exception if the (user-supplied) comparator throws.
const reference to the mapped value
| Name | Description |
|---|---|
| key | key whose mapped value is accessed |