JSON for Modern C++ 3.7.1

accept
accept
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at
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basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
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boolean_t
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end
end
erase
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find
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from_bson
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from_cbor
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from_ubjson
from_ubjson
front
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~basic_json
| ## ◆ from_ubjson() [2/2] 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>
static basic_json nlohmann::basic_json::from_ubjson | ( | detail::input_adapter && | i,
|  | const bool | strict = `true`,
|  | const bool | allow_exceptions = `true`
| ) |  |
| inline static
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; in case of a parse error and allow_exceptions set to `false`, the return value will be value_t::discarded. 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. 1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 7 int main() 8 { 9 // create byte vector 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 13 }; 14 15 // deserialize it with UBJSON 16 json j = json::from_ubjson(v); 17 18 // print the deserialized JSON value 19 std::cout << std::setw(2) << j << std::endl; 20 } 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 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 21677 of file json.hpp.

nlohmann::basic_json::from_ubjson
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
Definition: json.hpp:21677
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2445