JSON for Modern C++ 3.7.3

accept
accept
accept
allocator_type
array
array_t
at
at
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
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end
end
erase
erase
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find
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from_bson
from_bson
from_bson
from_cbor
from_cbor
from_cbor
from_msgpack
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from_msgpack
from_ubjson
from_ubjson
from_ubjson
front
front
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~basic_json
| ## ◆ from_cbor() [3/3] template<typename InputType >
static basic_json nlohmann::basic_json::from_cbor | ( | InputType && | i,
|  | const bool | strict = `true`,
|  | const bool | allow_exceptions = `true`
| ) |  |
| inline static
Deserializes a given input i to a JSON value using the CBOR (Concise Binary Object Representation) serialization format. The library maps CBOR types to JSON value types as follows:
CBOR type | JSON value type | first byte
--- | --- | ---
Integer | number_unsigned | 0x00..0x17
Unsigned integer | number_unsigned | 0x18
Unsigned integer | number_unsigned | 0x19
Unsigned integer | number_unsigned | 0x1A
Unsigned integer | number_unsigned | 0x1B
Negative integer | number_integer | 0x20..0x37
Negative integer | number_integer | 0x38
Negative integer | number_integer | 0x39
Negative integer | number_integer | 0x3A
Negative integer | number_integer | 0x3B
Byte string | binary | 0x40..0x57
Byte string | binary | 0x58
Byte string | binary | 0x59
Byte string | binary | 0x5A
Byte string | binary | 0x5B
UTF-8 string | string | 0x60..0x77
UTF-8 string | string | 0x78
UTF-8 string | string | 0x79
UTF-8 string | string | 0x7A
UTF-8 string | string | 0x7B
UTF-8 string | string | 0x7F
array | array | 0x80..0x97
array | array | 0x98
array | array | 0x99
array | array | 0x9A
array | array | 0x9B
array | array | 0x9F
map | object | 0xA0..0xB7
map | object | 0xB8
map | object | 0xB9
map | object | 0xBA
map | object | 0xBB
map | object | 0xBF
False | `false` | 0xF4
True | `true` | 0xF5
Null | `null` | 0xF6
Half-Precision Float | number_float | 0xF9
Single-Precision Float | number_float | 0xFA
Double-Precision Float | number_float | 0xFB
  Warning The mapping is incomplete in the sense that not all CBOR types can be converted to a JSON value. The following CBOR types are not supported and will yield parse errors (parse_error.112): date/time (0xC0..0xC1) bignum (0xC2..0xC3) decimal fraction (0xC4) bigfloat (0xC5) tagged items (0xC6..0xD4, 0xD8..0xDB) expected conversions (0xD5..0xD7) simple values (0xE0..0xF3, 0xF8) undefined (0xF7) CBOR allows map keys of any type, whereas JSON only allows strings as keys in object values. Therefore, CBOR maps with keys other than UTF-8 strings are rejected (parse_error.113). Note Any CBOR output created to_cbor can be successfully parsed by from_cbor. Parameters
  [in] | i | an input in CBOR 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 unsupported features from CBOR were used in the given input v or if the input is not valid CBOR
  parse_error.113 | if a string was expected as map key, but not found
  Complexity Linear in the size of the input i. Example The example shows the deserialization of a byte vector in CBOR 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 = {0xa2, 0x67, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63, 11 0x74, 0xf5, 0x66, 0x73, 0x63, 0x68, 0x65, 0x6d, 12 0x61, 0x00 13 }; 14 15 // deserialize it with CBOR 16 json j = json::from_cbor(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_cbor.cpp -o from_cbor
See also http://cbor.io to_cbor(const basic_json&) for the analogous serialization from_msgpack(detail::input_adapter&&, const bool, const bool) for the related MessagePack format from_ubjson(detail::input_adapter&&, const bool, const bool) for the related UBJSON format Since version 2.0.9; parameter start_index since 2.1.1; changed to consume input adapters, removed start_index parameter, and added strict parameter since 3.0.0; added allow_exceptions parameter since 3.2.0 Definition at line 23239 of file json.hpp.

nlohmann::basic_json::from_cbor
static basic_json from_cbor(InputType &&i, const bool strict=true, const bool allow_exceptions=true)
create a JSON value from an input in CBOR format
Definition: json.hpp:23239
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2774