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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>
Serialization function for JSON values. The function tries to mimick Python's json.dumps() function, and currently supports its indent parameter.
- Parameters
-
[in] | indent | if indent is nonnegative, then array elements and object members will be pretty-printed with that indent level. An indent level of 0 will only insert newlines. -1 (the default) selects the most compact representation |
- Returns
- string containing the serialization of the JSON value
- Complexity
- Linear.
- Example
- The following example shows the effect of different indent parameters to the result of the serializaion.
8 json j_object = {{ "one", 1}, { "two", 2}};
9 json j_array = {1, 2, 4, 8, 16};
12 std::cout << j_object. dump() << "\n\n";
13 std::cout << j_object. dump(-1) << "\n\n";
14 std::cout << j_object. dump(0) << "\n\n";
15 std::cout << j_object. dump(4) << "\n\n";
16 std::cout << j_array. dump() << "\n\n";
17 std::cout << j_array. dump(-1) << "\n\n";
18 std::cout << j_array. dump(0) << "\n\n";
19 std::cout << j_array. dump(4) << "\n\n";
a class to store JSON values Definition: json.hpp:124
string_t dump(const int indent=-1) const noexcept serialization Definition: json.hpp:1423
namespace for Niels Lohmann Definition: json.hpp:59
Output: {"one":1,"two":2}
{"one":1,"two":2}
{
"one": 1,
"two": 2
}
{
"one": 1,
"two": 2
}
[1,2,4,8,16]
[1,2,4,8,16]
[
1,
2,
4,
8,
16
]
[
1,
2,
4,
8,
16
]
The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/dump.cpp -o dump .
- See also
- https://docs.python.org/2/library/json.html#json.dump
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