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use std::borrow::Cow; #[derive(Clone)] pub struct OptionStringValue(pub Option<Cow<'static, str>>); pub trait IntoOptionStringValue { fn into_option_string_value(self) -> OptionStringValue; } impl IntoOptionStringValue for Cow<'static, str> { fn into_option_string_value(self) -> OptionStringValue { OptionStringValue(Some(self)) } } impl IntoOptionStringValue for String { fn into_option_string_value(self) -> OptionStringValue { OptionStringValue(Some(Cow::Owned(self))) } } impl IntoOptionStringValue for &'static str { fn into_option_string_value(self) -> OptionStringValue { OptionStringValue(Some(Cow::Borrowed(self))) } } impl IntoOptionStringValue for Option<Cow<'static, str>> { fn into_option_string_value(self) -> OptionStringValue { OptionStringValue(self) } } impl IntoOptionStringValue for Option<String> { fn into_option_string_value(self) -> OptionStringValue { OptionStringValue(self.map(Cow::Owned)) } } impl IntoOptionStringValue for Option<&'static str> { fn into_option_string_value(self) -> OptionStringValue { OptionStringValue(self.map(Cow::Borrowed)) } }