try_emplace overloads

Synopses

Declared in <bslstl_unorderedmap.h>

Emplace a value for movable key if missing.

template<class... Args>
pair<iterator, bool>
try_emplace(
    BloombergLP::bslmf::MovableRef<KEY> key,
    Args&&... args);

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Emplace a value for key if no equivalent key already exists.

template<class... Args>
pair<iterator, bool>
try_emplace(
    KEY const& key,
    Args&&... args);

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Emplace a value for transparent key if missing.

template<
    class LOOKUP_KEY,
    class... Args>
pair<iterator, bool>
try_emplace(
    LOOKUP_KEY&& key,
    Args&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value
        && !bsl::is_convertible<LOOKUP_KEY&&, const_iterator>::value
        && !bsl::is_convertible<LOOKUP_KEY&&, iterator>::value;

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Emplace a value for movable key at hint if missing.

template<class... Args>
iterator
try_emplace(
    const_iterator hint,
    BloombergLP::bslmf::MovableRef<KEY> key,
    Args&&... args);

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Emplace a value for key at hint if missing.

template<class... Args>
iterator
try_emplace(
    const_iterator hint,
    KEY const& key,
    Args&&... args);

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Emplace with transparent lookup key at hint.

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;

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Return Value

  • iterator to the element and whether insertion occurred

  • iterator to the existing or newly inserted element

Parameters

Name

Description

key

key to look up

args

constructor arguments for the new element

hint

iterator hint for insertion

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