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@@ -128,13 +128,31 @@ Linear.
depends on whether [`nlohmann::json`](../json.md) or [`nlohmann::ordered_json`](../ordered_json.md) is used:
```cpp
--8<-- "examples/operator__equal__specializations.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
nlohmann::json uj1 = {{"version", 1}, {"type", "integer"}};
nlohmann::json uj2 = {{"type", "integer"}, {"version", 1}};
nlohmann::ordered_json oj1 = {{"version", 1}, {"type", "integer"}};
nlohmann::ordered_json oj2 = {{"type", "integer"}, {"version", 1}};
std::cout << std::boolalpha << (uj1 == uj2) << '\n' << (oj1 == oj2) << std::endl;
}
```
Output:
```json
--8<-- "examples/operator__equal__specializations.output"
true
false
```
## Examples
@@ -144,13 +162,41 @@ Linear.
The example demonstrates comparing several JSON types.
```cpp
--8<-- "examples/operator__equal.cpp"
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create several JSON values
json array_1 = {1, 2, 3};
json array_2 = {1, 2, 4};
json object_1 = {{"A", "a"}, {"B", "b"}};
json object_2 = {{"B", "b"}, {"A", "a"}};
json number_1 = 17;
json number_2 = 17.000000000000001L;
json string_1 = "foo";
json string_2 = "bar";
// output values and comparisons
std::cout << std::boolalpha;
std::cout << array_1 << " == " << array_2 << " " << (array_1 == array_2) << '\n';
std::cout << object_1 << " == " << object_2 << " " << (object_1 == object_2) << '\n';
std::cout << number_1 << " == " << number_2 << " " << (number_1 == number_2) << '\n';
std::cout << string_1 << " == " << string_2 << " " << (string_1 == string_2) << '\n';
}
```
Output:
```json
--8<-- "examples/operator__equal.output"
[1,2,3] == [1,2,4] false
{"A":"a","B":"b"} == {"A":"a","B":"b"} true
17 == 17.0 true
"foo" == "bar" false
```
??? example "Example: (2) compare JSON values with `#!cpp nullptr`"
@@ -158,13 +204,40 @@ Linear.
The example demonstrates comparing several JSON types against the null pointer (JSON `#!json null`).
```cpp
--8<-- "examples/operator__equal__nullptr_t.cpp"
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create several JSON values
json array = {1, 2, 3};
json object = {{"A", "a"}, {"B", "b"}};
json number = 17;
json string = "foo";
json null;
// output values and comparisons
std::cout << std::boolalpha;
std::cout << array << " == nullptr " << (array == nullptr) << '\n';
std::cout << object << " == nullptr " << (object == nullptr) << '\n';
std::cout << number << " == nullptr " << (number == nullptr) << '\n';
std::cout << string << " == nullptr " << (string == nullptr) << '\n';
std::cout << null << " == nullptr " << (null == nullptr) << '\n';
}
```
Output:
```json
--8<-- "examples/operator__equal__nullptr_t.output"
[1,2,3] == nullptr false
{"A":"a","B":"b"} == nullptr false
17 == nullptr false
"foo" == nullptr false
null == nullptr true
```
## See also