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◆ operator<< [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 an input stream to a JSON value.
- Parameters
-
[in,out] | i | input stream to read a serialized JSON value from |
[in,out] | j | JSON value to write the deserialized input to |
- Exceptions
-
std::invalid_argument | in case of parse errors |
- Complexity\n Linear in the length of the input. The parser is a predictive
- LL(1) parser.
- Note
- A UTF-8 byte order mark is silently ignored.
- Example\n The example below shows how a JSON value is constructed by
- reading a serialization from a stream.
11 "string": "Hello, world!",
12 "array": [1, 2, 3, 4, 5],
22 std::cout << std::setw(2) << j << '\n';
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an array from an initializer list
a class to store JSON values
basic_json<> json default JSON class
Output (play with this example online):
{
"array": [
1,
2,
3,
4,
5
],
"boolean": false,
"null": null,
"number": 23,
"string": "Hello, world!"
}
The example code above can be translated with g++ -std=c++11 -Isrc doc/examples/operator_deserialize.cpp -o operator_deserialize
- See also
- parse(std::istream&, const parser_callback_t) for a variant with a parser callback function to filter values while parsing
- Since
- version 1.0.0
Definition at line 6514 of file json.hpp.
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