Return a const reference to the mapped value for an equivalent key.
Synopsis
Declared in <bslstl_unorderedmap.h>
template<class LOOKUP_KEY>
add_lvalue_reference<VALUE const>::type
at(LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
&& BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;Description
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.
Note: implemented inline due to Sun CC compilation error
Return Value
const reference to the mapped value
Parameters
Name |
Description |
key |
key to look up |
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