1
0
mirror of https://github.com/nlohmann/json.git synced 2025-07-31 10:24:23 +03:00

reorganized repo

This commit is contained in:
Niels
2015-06-21 21:24:03 +02:00
parent 4bb5126502
commit 91c330ae01
88 changed files with 313 additions and 321 deletions

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```cpp
iterator begin();
const_iterator begin() const;
const_iterator cbegin() const;
```
## Description
Returns an iterator to the first value in the JSON container. If the JSON container is empty, the returned iterator will be equal to [`end()`](https://github.com/nlohmann/json/wiki/nlohmann::basicjson::end).
![illustration of iterators](http://upload.cppreference.com/mwiki/images/1/1b/range-begin-end.svg)
## Parameters
None.
## Return value
Iterator to the first value. Note the return value its deferencabilty depends on the different value types:
| value type | deferenceable | description |
| ---------- | ------------- | ----------- |
| null | no | `null` has no value, always equal to [`end()`](https://github.com/nlohmann/json/wiki/nlohmann::basicjson::end) |
| boolean | yes | iterator to the boolean value |
| string | yes | iterator to the string value |
| number | yes | iterator to the number value |
| object | only if object is not empty | iterator to the begin of the object |
| array | only if array is not empty | iterator to the begin of the array |
## Complexity
Constant, as long as `ArrayType` and `ObjectType` satisfy the [Container concept](http://en.cppreference.com/w/cpp/concept/Container).
## Exceptions
None. The function's noexcept-specification is `noexcept`.
## See also
- [**end**, **cend**](https://github.com/nlohmann/json/wiki/nlohmann::basicjson::end)<br>
returns an iterator to the end

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/*!
@mainpage
See @ref nlohmann::basic_json
@copyright Niels Lohmann\n
@include "../../LICENSE.MIT"
*/

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# nlohmann::basic_json::empty
```cpp
bool empty() const noexcept;
```
Checks if the container has no elements; that is, whether `begin() == end()`.
## Parameters
(none)
## Return value
`true` if the container is empty, `false` otherwise. Note that the JSON types string, number, and boolean are never empty, null values are always empty.
## Exceptions
`noexcept` specification: `noexcept`.
## Complexity
Constant (assuming types `ObjectType` and `ArrayType` satisfy the [Container](http://en.cppreference.com/w/cpp/concept/Container) concept).
## Example
The following code uses empty to check if a `json` container contains any elements:
```cpp
#include <json.hpp>
#include <iostream>
int main()
{
nlohman::json numbers;
std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
numbers.push_back(42);
numbers.push_back(13317);
std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}
```
### Output
Initially, numbers.empty(): 1
After adding elements, numbers.empty(): 0
## Requirements
The `empty` member function is part of the [Container](http://en.cppreference.com/w/cpp/concept/Container) requirement.
## See also
- `size()`

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SRCDIR = ../../src
EXAMPLES = $(wildcard *.cpp)
all:
@echo "check"
@echo "create"
clean:
rm -f $(EXAMPLES:.cpp=) $(EXAMPLES:.cpp=.output) $(EXAMPLES:.cpp=.test)
%.output: %.cpp
make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
./$(<:.cpp=) > $@
rm $(<:.cpp=)
%.test: %.cpp
make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
./$(<:.cpp=) > $@
diff $@ $(<:.cpp=.output)
rm $(<:.cpp=) $@
create: $(EXAMPLES:.cpp=.output)
check: $(EXAMPLES:.cpp=.test)

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON arrays
json j_no_init_list = json::array();
json j_empty_init_list = json::array({});
json j_nonempty_init_list = json::array({1, 2, 3, 4});
json j_list_of_pairs = json::array({ {"one", 1}, {"two", 2} });
// serialize the JSON arrays
std::cout << j_no_init_list << '\n';
std::cout << j_empty_init_list << '\n';
std::cout << j_nonempty_init_list << '\n';
std::cout << j_list_of_pairs << '\n';
}

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[]
[]
[1,2,3,4]
[["one",1],["two",2]]

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_object_empty(json::value_t::object);
json j_array = {1, 2, 4, 8, 16};
json j_array_empty(json::value_t::array);
json j_string = "Hello, world";
// call back()
//std::cout << j_null.back() << '\n'; // would throw
std::cout << j_boolean.back() << '\n';
std::cout << j_number_integer.back() << '\n';
std::cout << j_number_float.back() << '\n';
std::cout << j_object.back() << '\n';
//std::cout << j_object_empty.back() << '\n'; // would throw
std::cout << j_array.back() << '\n';
//std::cout << j_array_empty.back() << '\n'; // would throw
std::cout << j_string.back() << '\n';
}

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true
17
23.42
2
16
"Hello, world"

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON value with default null value
json j;
// serialize the JSON null value
std::cout << j << '\n';
}

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null

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#include <json.hpp>
#include <deque>
#include <list>
#include <forward_list>
#include <set>
#include <unordered_set>
using namespace nlohmann;
int main()
{
// create an array from std::vector
std::vector<int> c_vector {1, 2, 3, 4};
json j_vec(c_vector);
// create an array from std::deque
std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};
json j_deque(c_deque);
// create an array from std::list
std::list<bool> c_list {true, true, false, true};
json j_list(c_list);
// create an array from std::forward_list
std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};
json j_flist(c_flist);
// create an array from std::array
std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};
json j_array(c_array);
// create an array from std::set
std::set<std::string> c_set {"one", "two", "three", "four", "one"};
json j_set(c_set); // only one entry for "one" is used
// create an array from std::unordered_set
std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"};
json j_uset(c_uset); // only one entry for "one" is used
// create an array from std::multiset
std::multiset<std::string> c_mset {"one", "two", "one", "four"};
json j_mset(c_mset); // only one entry for "one" is used
// create an array from std::unordered_multiset
std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"};
json j_umset(c_umset); // both entries for "one" are used
// serialize the JSON arrays
std::cout << j_vec << '\n';
std::cout << j_deque << '\n';
std::cout << j_list << '\n';
std::cout << j_flist << '\n';
std::cout << j_array << '\n';
std::cout << j_set << '\n';
std::cout << j_uset << '\n';
std::cout << j_mset << '\n';
std::cout << j_umset << '\n';
}

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[1,2,3,4]
[1.2,2.3,3.4,5.6]
[true,true,false,true]
[12345678909876,23456789098765,34567890987654,45678909876543]
[1,2,3,4]
["four","one","three","two"]
["four","three","two","one"]
["four","one","one","two"]
["four","two","one","one"]

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#include <json.hpp>
#include <unordered_map>
using namespace nlohmann;
int main()
{
// create an object from std::map
std::map<std::string, int> c_map
{
{"one", 1}, {"two", 2}, {"three", 3}
};
json j_map(c_map);
// create an object from std::unordered_map
std::unordered_map<const char*, double> c_umap
{
{"one", 1.2}, {"two", 2.3}, {"three", 3.4}
};
json j_umap(c_umap);
// create an object from std::multimap
std::multimap<std::string, bool> c_mmap
{
{"one", true}, {"two", true}, {"three", false}, {"three", true}
};
json j_mmap(c_mmap); // only one entry for key "three" is used
// create an object from std::unordered_multimap
std::unordered_multimap<std::string, bool> c_ummap
{
{"one", true}, {"two", true}, {"three", false}, {"three", true}
};
json j_ummap(c_ummap); // only one entry for key "three" is used
// serialize the JSON objects
std::cout << j_map << '\n';
std::cout << j_umap << '\n';
std::cout << j_mmap << '\n';
std::cout << j_ummap << '\n';
}

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{"one":1,"three":3,"two":2}
{"one":1.2,"three":3.4,"two":2.3}
{"one":true,"three":false,"two":true}
{"one":true,"three":false,"two":true}

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array_t value
json::array_t value = {"one", "two", 3, 4.5, false};
// create a JSON array from the value
json j(value);
// serialize the JSON array
std::cout << j << '\n';
}

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["one","two",3,4.5,false]

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON array
json j1 = {"one", "two", 3, 4.5, false};
// create a copy
json j2(j1);
// serialize the JSON array
std::cout << j1 << " = " << j2 << '\n';
std::cout << std::boolalpha << (j1 == j2) << '\n';
}

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["one","two",3,4.5,false] = ["one","two",3,4.5,false]
true

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json a = 23;
json b = 42;
// copy-assign a to b
b = a;
// serialize the JSON arrays
std::cout << a << '\n';
std::cout << b << '\n';
}

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23
23

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_empty_init_list = json({});
json j_object = { {"one", 1}, {"two", 2} };
json j_array = {1, 2, 3, 4};
json j_nested_object = { {"one", {1}}, {"two", {1, 2}} };
json j_nested_array = { {{1}, "one"}, {{1, 2}, "two"} };
// serialize the JSON value
std::cout << j_empty_init_list << '\n';
std::cout << j_object << '\n';
std::cout << j_array << '\n';
std::cout << j_nested_object << '\n';
std::cout << j_nested_array << '\n';
}

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{}
{"one":1,"two":2}
[1,2,3,4]
{"one":[1],"two":[1,2]}
[[[1],"one"],[[1,2],"two"]]

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON value
json a = 23;
// move contents of a to b
json b(std::move(a));
// serialize the JSON arrays
std::cout << a << '\n';
std::cout << b << '\n';
}

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null
23

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON null value
json j(nullptr);
// serialize the JSON null value
std::cout << j << '\n';
}

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null

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an object_t value
json::object_t value = { {"one", 1}, {"two", 2} };
// create a JSON object from the value
json j(value);
// serialize the JSON object
std::cout << j << '\n';
}

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{"one":1,"two":2}

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array by creating copies of a JSON value
json value = "Hello";
json array_0 = json(0, value);
json array_1 = json(1, value);
json array_5 = json(5, value);
// serialize the JSON arrays
std::cout << array_0 << '\n';
std::cout << array_1 << '\n';
std::cout << array_5 << '\n';
}

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[]
["Hello"]
["Hello","Hello","Hello","Hello","Hello"]

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create the different JSON values with default values
json j_null(json::value_t::null);
json j_boolean(json::value_t::boolean);
json j_number_integer(json::value_t::number_integer);
json j_number_float(json::value_t::number_float);
json j_object(json::value_t::object);
json j_array(json::value_t::array);
json j_string(json::value_t::string);
// serialize the JSON values
std::cout << j_null << '\n';
std::cout << j_boolean << '\n';
std::cout << j_number_integer << '\n';
std::cout << j_number_float << '\n';
std::cout << j_object << '\n';
std::cout << j_array << '\n';
std::cout << j_string << '\n';
}

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null
false
0
0
{}
[]
""

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get am iterator to the first element
json::iterator it = array.begin();
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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1

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
const json array = {1, 2, 3, 4, 5};
// get am iterator to the first element
json::const_iterator it = array.cbegin();
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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1

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get am iterator to one past the last element
json::const_iterator it = array.cend();
// decrement the iterator to point to the last element
--it;
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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5

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call clear()
j_null.clear();
j_boolean.clear();
j_number_integer.clear();
j_number_float.clear();
j_object.clear();
j_array.clear();
j_string.clear();
// serialize the cleared values()
std::cout << j_null << '\n';
std::cout << j_boolean << '\n';
std::cout << j_number_integer << '\n';
std::cout << j_number_float << '\n';
std::cout << j_object << '\n';
std::cout << j_array << '\n';
std::cout << j_string << '\n';
}

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null
false
0
0
{}
[]
""

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get an iterator to the reverse-beginning
json::const_reverse_iterator it = array.crbegin();
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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5

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get an iterator to the reverse-end
json::const_reverse_iterator it = array.crend();
// increment the iterator to point to the first element
--it;
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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1

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
// call dump()
std::cout << j_object.dump() << "\n\n";
std::cout << j_object.dump(-1) << "\n\n";
std::cout << j_object.dump(0) << "\n\n";
std::cout << j_object.dump(4) << "\n\n";
std::cout << j_array.dump() << "\n\n";
std::cout << j_array.dump(-1) << "\n\n";
std::cout << j_array.dump(0) << "\n\n";
std::cout << j_array.dump(4) << "\n\n";
}

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{"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
]

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#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_object_empty(json::value_t::object);
json j_array = {1, 2, 4, 8, 16};
json j_array_empty(json::value_t::array);
json j_string = "Hello, world";
// call empty()
std::cout << std::boolalpha;
std::cout << j_null.empty() << '\n';
std::cout << j_boolean.empty() << '\n';
std::cout << j_number_integer.empty() << '\n';
std::cout << j_number_float.empty() << '\n';
std::cout << j_object.empty() << '\n';
std::cout << j_object_empty.empty() << '\n';
std::cout << j_array.empty() << '\n';
std::cout << j_array_empty.empty() << '\n';
std::cout << j_string.empty() << '\n';
}

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true
false
false
false
false
true
false
true
false

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@ -1,18 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get am iterator to one past the last element
json::iterator it = array.end();
// decrement the iterator to point to the last element
--it;
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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5

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@ -1,28 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_object_empty(json::value_t::object);
json j_array = {1, 2, 4, 8, 16};
json j_array_empty(json::value_t::array);
json j_string = "Hello, world";
// call front()
//std::cout << j_null.front() << '\n'; // would throw
std::cout << j_boolean.front() << '\n';
std::cout << j_number_integer.front() << '\n';
std::cout << j_number_float.front() << '\n';
std::cout << j_object.front() << '\n';
//std::cout << j_object_empty.front() << '\n'; // would throw
std::cout << j_array.front() << '\n';
//std::cout << j_array_empty.front() << '\n'; // would throw
std::cout << j_string.front() << '\n';
}

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true
17
23.42
1
1
"Hello, world"

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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_array()
std::cout << std::boolalpha;
std::cout << j_null.is_array() << '\n';
std::cout << j_boolean.is_array() << '\n';
std::cout << j_number_integer.is_array() << '\n';
std::cout << j_number_float.is_array() << '\n';
std::cout << j_object.is_array() << '\n';
std::cout << j_array.is_array() << '\n';
std::cout << j_string.is_array() << '\n';
}

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false
false
false
false
false
true
false

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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_boolean()
std::cout << std::boolalpha;
std::cout << j_null.is_boolean() << '\n';
std::cout << j_boolean.is_boolean() << '\n';
std::cout << j_number_integer.is_boolean() << '\n';
std::cout << j_number_float.is_boolean() << '\n';
std::cout << j_object.is_boolean() << '\n';
std::cout << j_array.is_boolean() << '\n';
std::cout << j_string.is_boolean() << '\n';
}

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false
true
false
false
false
false
false

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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_null()
std::cout << std::boolalpha;
std::cout << j_null.is_null() << '\n';
std::cout << j_boolean.is_null() << '\n';
std::cout << j_number_integer.is_null() << '\n';
std::cout << j_number_float.is_null() << '\n';
std::cout << j_object.is_null() << '\n';
std::cout << j_array.is_null() << '\n';
std::cout << j_string.is_null() << '\n';
}

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@ -1,7 +0,0 @@
true
false
false
false
false
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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_number()
std::cout << std::boolalpha;
std::cout << j_null.is_number() << '\n';
std::cout << j_boolean.is_number() << '\n';
std::cout << j_number_integer.is_number() << '\n';
std::cout << j_number_float.is_number() << '\n';
std::cout << j_object.is_number() << '\n';
std::cout << j_array.is_number() << '\n';
std::cout << j_string.is_number() << '\n';
}

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@ -1,7 +0,0 @@
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true
true
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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_number_float()
std::cout << std::boolalpha;
std::cout << j_null.is_number_float() << '\n';
std::cout << j_boolean.is_number_float() << '\n';
std::cout << j_number_integer.is_number_float() << '\n';
std::cout << j_number_float.is_number_float() << '\n';
std::cout << j_object.is_number_float() << '\n';
std::cout << j_array.is_number_float() << '\n';
std::cout << j_string.is_number_float() << '\n';
}

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@ -1,7 +0,0 @@
false
false
false
true
false
false
false

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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_number_integer()
std::cout << std::boolalpha;
std::cout << j_null.is_number_integer() << '\n';
std::cout << j_boolean.is_number_integer() << '\n';
std::cout << j_number_integer.is_number_integer() << '\n';
std::cout << j_number_float.is_number_integer() << '\n';
std::cout << j_object.is_number_integer() << '\n';
std::cout << j_array.is_number_integer() << '\n';
std::cout << j_string.is_number_integer() << '\n';
}

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@ -1,7 +0,0 @@
false
false
true
false
false
false
false

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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_object()
std::cout << std::boolalpha;
std::cout << j_null.is_object() << '\n';
std::cout << j_boolean.is_object() << '\n';
std::cout << j_number_integer.is_object() << '\n';
std::cout << j_number_float.is_object() << '\n';
std::cout << j_object.is_object() << '\n';
std::cout << j_array.is_object() << '\n';
std::cout << j_string.is_object() << '\n';
}

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@ -1,7 +0,0 @@
false
false
false
false
true
false
false

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@ -1,25 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call is_string()
std::cout << std::boolalpha;
std::cout << j_null.is_string() << '\n';
std::cout << j_boolean.is_string() << '\n';
std::cout << j_number_integer.is_string() << '\n';
std::cout << j_number_float.is_string() << '\n';
std::cout << j_object.is_string() << '\n';
std::cout << j_array.is_string() << '\n';
std::cout << j_string.is_string() << '\n';
}

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@ -1,7 +0,0 @@
false
false
false
false
false
false
true

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@ -1,24 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call max_size()
std::cout << j_null.max_size() << '\n';
std::cout << j_boolean.max_size() << '\n';
std::cout << j_number_integer.max_size() << '\n';
std::cout << j_number_float.max_size() << '\n';
std::cout << j_object.max_size() << '\n';
std::cout << j_array.max_size() << '\n';
std::cout << j_string.max_size() << '\n';
}

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@ -1,7 +0,0 @@
0
1
1
1
256204778801521550
1152921504606846975
1

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@ -1,17 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON arrays
json j_no_init_list = json::object();
json j_empty_init_list = json::object({});
json j_list_of_pairs = json::object({ {"one", 1}, {"two", 2} });
//json j_invalid_list = json::object({ "one", 1 }); // would throw
// serialize the JSON arrays
std::cout << j_no_init_list << '\n';
std::cout << j_empty_init_list << '\n';
std::cout << j_list_of_pairs << '\n';
}

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@ -1,3 +0,0 @@
{}
{}
{"one":1,"two":2}

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@ -1,15 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get an iterator to the reverse-beginning
json::reverse_iterator it = array.rbegin();
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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@ -1 +0,0 @@
5

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@ -1,18 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an array value
json array = {1, 2, 3, 4, 5};
// get an iterator to the reverse-end
json::reverse_iterator it = array.rend();
// increment the iterator to point to the first element
--it;
// serialize the element that the iterator points to
std::cout << *it << '\n';
}

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@ -1 +0,0 @@
1

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@ -1,28 +0,0 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_object_empty(json::value_t::object);
json j_array = {1, 2, 4, 8, 16};
json j_array_empty(json::value_t::array);
json j_string = "Hello, world";
// call size()
std::cout << j_null.size() << '\n';
std::cout << j_boolean.size() << '\n';
std::cout << j_number_integer.size() << '\n';
std::cout << j_number_float.size() << '\n';
std::cout << j_object.size() << '\n';
std::cout << j_object_empty.size() << '\n';
std::cout << j_array.size() << '\n';
std::cout << j_array_empty.size() << '\n';
std::cout << j_string.size() << '\n';
}

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@ -1,9 +0,0 @@
0
1
1
1
2
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5
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1

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# nlohmann::basic_json
Defined in header `<json.hpp>`
```cpp
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 Allocator = std::allocator
> class basic_json;
```
## Template Parameters
- `ObjectType` - The type to store collection of name/value pairs. It can be any associative container that can hold key-value pairs as long as the key type is the same as `StringType`. The value type is again `nlohmann::basic_json`. The parameter `ObjectType` defaults to [`std::map`](http://en.cppreference.com/w/cpp/container/map).
- `ArrayType` - The type to store ordered value lists. It can be any sequence container. The parameter `ArrayType` defaults to a [`std::vector`](http://en.cppreference.com/w/cpp/container/vector) whose elements are of type `nlohmann::basic_json`.
- `StringType` - The type to store string values. The parameter `StringType` defaults to [`std::string`](http://en.cppreference.com/w/cpp/string/basic_string).
- `BooleanType`
- `NumberIntegerType`
- `NumberFloatType`
- `Allocator` - An allocator that is used to acquire memory to store the elements. The type must meet the requirements of [`Allocator`](http://en.cppreference.com/w/cpp/concept/Allocator).
## Specializations
A standard JSON type `nlohmann::json` is defined in `<json.hpp>` which uses the default types:
```cpp
using json = basic_json<
std::map,
std::vector,
std::string,
bool,
int64_t,
double,
std::allocator
>
```
## Iterator invalidation
## Member types
- `value_type`
- `reference`
- `const_reference`
- `difference_type`
- `size_type`
- `allocator_type`
- `pointer`
- `const_pointer`
- `iterator`
- `const_iterator`
- `reverse_iterator`
- `const_reverse_iterator`
- `object_t`
- `array_t`
- `string_t`
- `boolean_t`
- `number_integer_t`
- `number_float_t`
- `list_init_t`
- `json_value`
## Member functions
- constructor
- destructor
- `operator=`
- `get_allocator`
### Object inspection
- `dump`
- `type`
- `is_null`
- `is_boolean`
- `is_number`
- `is_object`
- `is_array`
- `is_string`
- `operator value_t`
- `std::hash`
### Value conversion
- `get`
- implicit conversion
### Element access
- `at`
- `operator[]`
- `erase`
- `find`
- `count`
### Iterators
- `begin` / `cbegin`
- `end` / `cend`
- `rbegin` / `crbegin`
- `rend` / `crend`
### Capacity
- [`empty`](empty)
- `size`
- `max_size`
### Modifiers
- `clear`
- `push_back`
- `operator+=`
- `erase`
- `swap`
- `std::swap`
### Comparisons
- `operator==`
- `operator!=`
- `operator<`
- `operator<=`
- `operator>`
- `operator>=`
### Serialization
- `dump`
- `operator<<`
- `operator>>`
### Deserialization
- `parse`
- `operator<<`
- `operator>>`

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