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Merge pull request #1474 from nickaein/develop

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Implement contains() member function
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Niels Lohmann
2019-02-13 13:05:21 +01:00
committed by GitHub
parent c55cacee1e e93f305494
commit e326df211b
3 changed files with 153 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;
}
/*!
@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;
}
}
/// @}