Try to emplace an element with key using a placement hint.

Synopsis

Declared in <bdlc_flathashmap.h>

template<
    class LOOKUP_KEY,
    class... ARGS>
iterator
try_emplace(
    const_iterator hint,
    LOOKUP_KEY&& key,
    ARGS&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
         && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;

Description

If a key equivalent to the specified key already exists in this map return an iterator referring to the existing item. Otherwise, insert into this map a newly‐created value_type object, constructed from std::forward<LOOKUP_KEY>(key) and the specified args, and return an iterator referring to the newly‐created entry. This method requires that the (template parameter) types KEY and VALUE are emplace‐constructible from key and args respectively. For C++03, VALUE must also be copy‐constructible.

Return Value

iterator to the existing or newly inserted element

Parameters

Name

Description

hint

iterator hint (ignored)

key

transparent key of the element to emplace

args

arguments forwarded to construct the mapped value

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