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started to implement #283

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Niels
2016-07-23 09:59:09 +02:00
parent ddfe86cc49
commit 75dbbc55cf
3 changed files with 260 additions and 113 deletions
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53
src/json.hpp.re2c
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@ -3633,8 +3633,8 @@ class basic_json
/*!
@brief access specified object element with default value
Returns either a copy of an object's element at the specified key @a key or
a given default value if no element with key @a key exists.
Returns either a copy of an object's element at the specified key @a key
or a given default value if no element with key @a key exists.
The function is basically equivalent to executing
@code {.cpp}
@ -3706,13 +3706,60 @@ class basic_json
/*!
@brief overload for a default value of type const char*
@copydoc basic_json::value()
@copydoc basic_json::value(const typename object_t::key_type&, ValueType)
*/
string_t value(const typename object_t::key_type& key, const char* default_value) const
{
return value(key, string_t(default_value));
}
/*!
@brief access specified object element via JSON Pointer with default value
@param[in] ptr a JSON pointer to the element to access
@param[in] default_value the value to return if @a ptr found no value
@tparam ValueType type compatible to JSON values, for instance `int` for
JSON integer numbers, `bool` for JSON booleans, or `std::vector` types for
JSON arrays. Note the type of the expected value at @a key and the default
value @a default_value must be compatible.
@since version 2.0.2
*/
template <class ValueType, typename
std::enable_if<
std::is_convertible<basic_json_t, ValueType>::value
, int>::type = 0>
ValueType value(const json_pointer& ptr, ValueType default_value) const
{
// at only works for objects
if (is_object())
{
// if pointer resolves a value, return it or use default value
try
{
return ptr.get_checked(this);
}
catch (std::out_of_range&)
{
return default_value;
}
}
else
{
throw std::domain_error("cannot use value() with " + type_name());
}
}
/*!
@brief overload for a default value of type const char*
@copydoc basic_json::value(const json_pointer&, ValueType)
*/
string_t value(const json_pointer& ptr, const char* default_value) const
{
return value(ptr, string_t(default_value));
}
/*!
@brief access the first element