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fix issue#1275

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This commit is contained in:
chenguoping 2020-06-10 19:27:28 +08:00
parent 28048d8207
commit 71830be06d
2 changed files with 50 additions and 0 deletions
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25
include/nlohmann/json.hpp
View file

@ -3788,6 +3788,31 @@ class basic_json
JSON_THROW(type_error::create(306, "cannot use value() with " + std::string(type_name()))); JSON_THROW(type_error::create(306, "cannot use value() with " + std::string(type_name())));
} }
/*!
@brief overload for a default value of type rvalue
@copydoc basic_json::value(const typename object_t::key_type&, const ValueType&) const
*/
template<class ValueType, typename std::enable_if<
std::is_convertible<basic_json_t, detail::uncvref_t<ValueType>>::value
and not std::is_same<value_t, ValueType>::value, int>::type = 0>
detail::uncvref_t<ValueType> value(const typename object_t::key_type& key, ValueType && default_value) &&
{
// only works for objects
if (JSON_HEDLEY_LIKELY(is_object()))
{
// if key is found, return value and given default value otherwise
const auto it = find(key);
if (it != end())
{
return std::move(it->template get_ref<ValueType&>());
}
return std::forward<ValueType>(default_value);
}
JSON_THROW(type_error::create(306, "cannot use value() with " + std::string(type_name())));
}
/*! /*!
@brief overload for a default value of type const char* @brief overload for a default value of type const char*
@copydoc basic_json::value(const typename object_t::key_type&, const ValueType&) const @copydoc basic_json::value(const typename object_t::key_type&, const ValueType&) const

25
single_include/nlohmann/json.hpp
View file

@ -19566,6 +19566,31 @@ class basic_json
JSON_THROW(type_error::create(306, "cannot use value() with " + std::string(type_name()))); JSON_THROW(type_error::create(306, "cannot use value() with " + std::string(type_name())));
} }
/*!
@brief overload for a default value of type rvalue
@copydoc basic_json::value(const typename object_t::key_type&, const ValueType&) const
*/
template<class ValueType, typename std::enable_if<
std::is_convertible<basic_json_t, detail::uncvref_t<ValueType>>::value
and not std::is_same<value_t, ValueType>::value, int>::type = 0>
detail::uncvref_t<ValueType> value(const typename object_t::key_type& key, ValueType && default_value) &&
{
// only works for objects
if (JSON_HEDLEY_LIKELY(is_object()))
{
// if key is found, return value and given default value otherwise
const auto it = find(key);
if (it != end())
{
return std::move(it->template get_ref<ValueType&>());
}
return std::forward<ValueType>(default_value);
}
JSON_THROW(type_error::create(306, "cannot use value() with " + std::string(type_name())));
}
/*! /*!
@brief overload for a default value of type const char* @brief overload for a default value of type const char*
@copydoc basic_json::value(const typename object_t::key_type&, const ValueType&) const @copydoc basic_json::value(const typename object_t::key_type&, const ValueType&) const