pub trait FromValueOptional<'a>: StaticType + Sized {
unsafe fn from_value_optional(_: &'a Value) -> Option<Self>;
}Extracts a value.
Types that don't support a None value always return Some.
unsafe fn from_value_optional(_: &'a Value) -> Option<Self>impl<'a> FromValueOptional<'a> for String[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for &'a str[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for bool[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for i8[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for u8[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for i32[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for u32[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for i64[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for u64[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for f32[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]impl<'a> FromValueOptional<'a> for f64[src]unsafe fn from_value_optional(value: &'a Value) -> Option<Self>[src]