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◆ from_ubjson() [3/4]
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, class BinaryType = std::vector<std::uint8_t>>
template<typename InputType >
static basic_json nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::from_ubjson |
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InputType && |
i, |
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const bool |
strict = true , |
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const bool |
allow_exceptions = true |
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inlinestatic |
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 |
high-precision number | number_integer, number_unsigned, or number_float - depends on number string | 'H' |
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
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[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; in case of a parse error and allow_exceptions set to
false , the return value will be value_t::discarded.
- Exceptions
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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;
static basic_json from_ubjson(InputType &&i, const bool strict=true, const bool allow_exceptions=true) create a JSON value from an input in UBJSON format
basic_json<> json default JSON class
Output (play with this example online): {
"compact": true,
"schema": 0
}
The example code above can be translated with g++ -std=c++11 -Isingle_include doc/examples/from_ubjson.cpp -o from_ubjson
- See also
- http://ubjson.org
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see to_ubjson(const basic_json&, const bool, const bool) for the analogous serialization
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see from_cbor(InputType&&, const bool, const bool, const cbor_tag_handler_t) for the related CBOR format
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see from_msgpack(InputType&&, const bool, const bool) for the related MessagePack format
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see from_bson(InputType&&, 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 25493 of file json.hpp.
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