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# `rfl::Size`
`rfl::Size` can be used to impose constraints on any container that contains the method `.size()`, which includes `std::string`.
For instance, you can a require a vector to be non-empty as follows:
```cpp
using NonEmptyStringVector =
rfl::Validator<std::vector<std::string>, rfl::Size<rfl::Minimum<1>>>;
```
Or you could require it to contain exactly zero or three elements, using validator composition:
```cpp
using NoneOrThree =
rfl::Validator<std::vector<std::string>,
rfl::Size<rfl::AnyOf<rfl::EqualTo<0>, rfl::EqualTo<3>>>>;
```
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