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nlohmann
2026-10-03 05:43:12 +00:00
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features/element_access/default_value.md
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@@ -41,9 +41,9 @@ you want to access and a default value in case there is no value stored with tha
The value function is a template, and the return type of the function is determined by the type of the provided
default value unless otherwise specified. This can have unexpected effects. In the example below, we store a 64-bit
unsigned integer. We get exactly that value when using [`operator[]`](../../api/basic_json/operator[].md). However,
when we call `value` and provide `#!c 0` as default value, then `#!c -1` is returned. This occurs, because `#!c 0`
has type `#!c int` which overflows when handling the value `#!c 18446744073709551615`.
unsigned integer. We get exactly that value when using [`operator[]`](../../api/basic_json/operator%5B%5D.md).
However, when we call `value` and provide `#!c 0` as default value, then `#!c -1` is returned. This occurs,
because `#!c 0` has type `#!c int` which overflows when handling the value `#!c 18446744073709551615`.
To address this issue, either provide a correctly typed default value or use the template parameter to specify the
desired return type. Note that this issue occurs even when a value is stored at the provided key, and the default