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Docs: Fix wrong code usage in the Value access section of json_pointer.md
(#4255)
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@ -71,10 +71,10 @@ auto j = json::parse(R"({
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})");
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// access values
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auto val = j["/"_json_pointer]; // {"array":["A","B","C"],...}
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auto val = j[""_json_pointer]; // {"array":["A","B","C"],...}
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auto val1 = j["/nested/one"_json_pointer]; // 1
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auto val2 = j.at[json::json_pointer("/nested/three/1")]; // false
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auto val3 = j.value[json::json_pointer("/nested/four", 0)]; // 0
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auto val2 = j.at(json::json_pointer("/nested/three/1")); // false
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auto val3 = j.value(json::json_pointer("/nested/four"), 0); // 0
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```
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## Flatten / unflatten
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