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# `rfl::Binary`, `rfl::Hex` and `rfl::Oct`
`rfl::Binary`, `rfl::Hex` and `rfl::Oct` can be used to express numbers
in binary, hex and octal format.
```cpp
struct ExampleStruct {
rfl::Binary<uint8_t> binary;
rfl::Hex<int> hex;
rfl::Oct<int> oct;
};
const auto example = ExampleStruct{
.binary = 30,
.hex = 30,
.oct = 30};
```
This results in the following JSON:
```json
{"binary":"00011110","hex":"1e","oct":"36"}
```
Note that the contained type must be integral for `rfl::Hex` and `rfl::Oct`. For `rfl::Binary`, it must be unsigned. Moreover,
the number of digits for `rfl::Binary` will be determined by the bitsize of the type.
You can access the contained value using `.value()`, `.get()` or simply `operator()`.
You can produce the string representation using `.str()`.
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