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