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◆ from_msgpack() [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_msgpack |
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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 MessagePack serialization format.
The library maps MessagePack types to JSON value types as follows:
| MessagePack type | JSON value type | first byte |
| positive fixint | number_unsigned | 0x00..0x7F |
| fixmap | object | 0x80..0x8F |
| fixarray | array | 0x90..0x9F |
| fixstr | string | 0xA0..0xBF |
| nil | null | 0xC0 |
| false | false | 0xC2 |
| true | true | 0xC3 |
| float 32 | number_float | 0xCA |
| float 64 | number_float | 0xCB |
| uint 8 | number_unsigned | 0xCC |
| uint 16 | number_unsigned | 0xCD |
| uint 32 | number_unsigned | 0xCE |
| uint 64 | number_unsigned | 0xCF |
| int 8 | number_integer | 0xD0 |
| int 16 | number_integer | 0xD1 |
| int 32 | number_integer | 0xD2 |
| int 64 | number_integer | 0xD3 |
| str 8 | string | 0xD9 |
| str 16 | string | 0xDA |
| str 32 | string | 0xDB |
| array 16 | array | 0xDC |
| array 32 | array | 0xDD |
| map 16 | object | 0xDE |
| map 32 | object | 0xDF |
| bin 8 | binary | 0xC4 |
| bin 16 | binary | 0xC5 |
| bin 32 | binary | 0xC6 |
| ext 8 | binary | 0xC7 |
| ext 16 | binary | 0xC8 |
| ext 32 | binary | 0xC9 |
| fixext 1 | binary | 0xD4 |
| fixext 2 | binary | 0xD5 |
| fixext 4 | binary | 0xD6 |
| fixext 8 | binary | 0xD7 |
| fixext 16 | binary | 0xD8 |
| negative fixint | number_integer | 0xE0-0xFF |
- Note
- Any MessagePack output created to_msgpack can be successfully parsed by from_msgpack.
- Parameters
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| [in] | i | an input in MessagePack 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 unsupported features from MessagePack were used in the given input i or if the input is not valid MessagePack |
| 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 MessagePack format to a JSON value.
3 #include <nlohmann/json.hpp>
10 std::vector<uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,
11 0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,
19 std::cout << std::setw(2) << j << std::endl;
static basic_json from_msgpack(InputType &&i, const bool strict=true, const bool allow_exceptions=true) create a JSON value from an input in MessagePack format
basic_json<> json default JSON class
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_msgpack.cpp -o from_msgpack
- See also
- http://msgpack.org
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see to_msgpack(const basic_json&) 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_ubjson(InputType&&, const bool, const bool) for the related UBJSON format
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see from_bson(InputType&&, const bool, const bool) for the related BSON 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 24851 of file json.hpp.
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