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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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
std::istream& operator<< |
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basic_json & |
j, |
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std::istream & |
i |
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) |
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friend |
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
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std::invalid_argument | in case of parse errors |
- Complexity
- Linear in the length of the input. The parser is a predictive LL(1) parser.
- Example
- 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';
a class to store JSON values Definition: json.hpp:130
namespace for Niels Lohmann Definition: json.hpp:55
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 withg++ -std=c++11 -Isrc doc/examples/operator_deserialize.cpp -o operator_deserialize
- See also
- parse(std::istream&, parser_callback_t) for a variant with a parser callback function to filter values while parsing
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