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◆ from_ubjson() [1/2]
template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
Deserializes a given input i to a JSON value using the UBJSON (Universal Binary JSON) serialization format.
The library maps UBJSON types to JSON value types as follows:
UBJSON type | JSON value type | marker |
no-op | no value, next value is read | N |
null | null | Z |
false | false | F |
true | true | T |
float32 | number_float | d |
float64 | number_float | D |
uint8 | number_unsigned | U |
int8 | number_integer | i |
int16 | number_integer | I |
int32 | number_integer | l |
int64 | number_integer | L |
string | string | S |
char | string | C |
array | array (optimized values are supported) | [ |
object | object (optimized values are supported) | { |
- Note
- The mapping is complete in the sense that any UBJSON value can be converted to a JSON value.
- Parameters
-
[in] | i | an input in UBJSON format convertible to an input adapter |
[in] | strict | whether to expect the input to be consumed until EOF (true by default) |
[in] | allow_exceptions | whether to throw exceptions in case of a parse error (optional, true by default) |
- Returns
- deserialized JSON value
- Exceptions
-
parse_error.110 | if the given input ends prematurely or the end of file was not reached when strict was set to true |
parse_error.112 | if a parse error occurs |
parse_error.113 | if a string could not be parsed successfully |
- Complexity^^ Linear in the size of the input i.
- Example^^ The example shows the deserialization of a byte vector in
- UBJSON format to a JSON value. ^^
3 #include <nlohmann/json.hpp> 10 std::vector<uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61, 11 0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68, 12 0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D 19 std::cout << std::setw(2) << j << std::endl; basic_json<> json default JSON class
static basic_json from_ubjson(detail::input_adapter &&i, const bool strict=true, const bool allow_exceptions=true) create a JSON value from an input in UBJSON format
Output (play with this example online):^^ {
"compact": true,
"schema": 0
}
^^ The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/from_ubjson.cpp -o from_ubjson
- See also
- http://ubjson.org
-
to_ubjson(const basic_json&, const bool, const bool) for the analogous serialization
-
from_cbor(detail::input_adapter&&, const bool, const bool) for the related CBOR format
-
from_msgpack(detail::input_adapter&&, const bool, const bool) for the related MessagePack format
-
from_bson(detail::input_adapter&&, const bool, const bool) for the related BSON format
- Since
- version 3.1.0; added allow_exceptions parameter since 3.2.0
Definition at line 19407 of file json.hpp.
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