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Implement contains() to check existence of a key

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Isaac Nickaein 2019-02-10 16:40:30 +03:30
parent 68ec3eb8d6
commit 6a5db00951
2 changed files with 66 additions and 0 deletions
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33
include/nlohmann/json.hpp
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@ -3957,6 +3957,39 @@ class basic_json
return is_object() ? m_value.object->count(std::forward<KeyT>(key)) : 0; return is_object() ? m_value.object->count(std::forward<KeyT>(key)) : 0;
} }
/*!
@brief check the existence of an element in a JSON object
Check whether an element exists in a JSON object with key equivalent to
@a key. If the element is not found or the JSON value is not an object,
false is returned.
@note This method always returns false when executed on a JSON type
that is not an object.
@param[in] key key value to check its existence.
@return true if an element with specified @a key exists. If no such
element with such key is found or the JSON value is not an object,
false is returned.
@complexity Logarithmic in the size of the JSON object.
@since version 3.6.0
*/
template<typename KeyT>
bool contains(KeyT&& key) const
{
if (is_object())
{
return (m_value.object->find(std::forward<KeyT>(key)) != m_value.object->end());
}
else
{
return false;
}
}
/// @} /// @}

33
single_include/nlohmann/json.hpp
View file

@ -16456,6 +16456,39 @@ class basic_json
return is_object() ? m_value.object->count(std::forward<KeyT>(key)) : 0; return is_object() ? m_value.object->count(std::forward<KeyT>(key)) : 0;
} }
/*!
@brief check the existence of an element in a JSON object
Check whether an element exists in a JSON object with key equivalent to
@a key. If the element is not found or the JSON value is not an object,
false is returned.
@note This method always returns false when executed on a JSON type
that is not an object.
@param[in] key key value to check its existence.
@return true if an element with specified @a key exists. If no such
element with such key is found or the JSON value is not an object,
false is returned.
@complexity Logarithmic in the size of the JSON object.
@since version 3.6.0
*/
template<typename KeyT>
bool contains(KeyT&& key) const
{
if (is_object())
{
return (m_value.object->find(std::forward<KeyT>(key)) != m_value.object->end());
}
else
{
return false;
}
}
/// @} /// @}