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/// Validate and deserialize signed integers.
pub trait ValidateSignedInteger: Sized {
    type Error;

    fn parse_i128(i: i128) -> Result<Self, Self::Error>;

    fn validate_i128(i: i128) -> Result<(), Self::Error>;

    #[cfg(target_pointer_width = "128")]
    #[inline]
    fn parse_isize(i: isize) -> Result<Self, Self::Error> {
        Self::parse_i128(i as i128)
    }

    #[cfg(not(any(
        target_pointer_width = "128",
        target_pointer_width = "32",
        target_pointer_width = "16",
        target_pointer_width = "8"
    )))]
    #[inline]
    fn parse_isize(i: isize) -> Result<Self, Self::Error> {
        Self::parse_i64(i as i64)
    }

    #[cfg(target_pointer_width = "32")]
    #[inline]
    fn parse_isize(i: isize) -> Result<Self, Self::Error> {
        Self::parse_i32(i as i32)
    }

    #[cfg(target_pointer_width = "16")]
    #[inline]
    fn parse_isize(i: isize) -> Result<Self, Self::Error> {
        Self::parse_i16(i as i16)
    }

    #[cfg(target_pointer_width = "8")]
    #[inline]
    fn parse_isize(i: isize) -> Result<Self, Self::Error> {
        Self::parse_i8(i as i8)
    }

    #[inline]
    fn parse_i64(i: i64) -> Result<Self, Self::Error> {
        Self::parse_i128(i as i128)
    }

    #[inline]
    fn parse_i32(i: i32) -> Result<Self, Self::Error> {
        Self::parse_i64(i as i64)
    }

    #[inline]
    fn parse_i16(i: i16) -> Result<Self, Self::Error> {
        Self::parse_i32(i as i32)
    }

    #[inline]
    fn parse_i8(i: i8) -> Result<Self, Self::Error> {
        Self::parse_i16(i as i16)
    }

    #[cfg(target_pointer_width = "128")]
    #[inline]
    fn validate_isize(i: isize) -> Result<(), Self::Error> {
        Self::validate_i128(i as i128)
    }

    #[cfg(not(any(
        target_pointer_width = "128",
        target_pointer_width = "32",
        target_pointer_width = "16",
        target_pointer_width = "8"
    )))]
    #[inline]
    fn validate_isize(i: isize) -> Result<(), Self::Error> {
        Self::validate_i64(i as i64)
    }

    #[cfg(target_pointer_width = "32")]
    #[inline]
    fn validate_isize(i: isize) -> Result<(), Self::Error> {
        Self::validate_i32(i as i32)
    }

    #[cfg(target_pointer_width = "16")]
    #[inline]
    fn validate_isize(i: isize) -> Result<(), Self::Error> {
        Self::validate_i16(i as i16)
    }

    #[cfg(target_pointer_width = "8")]
    #[inline]
    fn validate_isize(i: isize) -> Result<(), Self::Error> {
        Self::validate_i8(i as i8)
    }

    #[inline]
    fn validate_i64(i: i64) -> Result<(), Self::Error> {
        Self::validate_i128(i as i128)
    }

    #[inline]
    fn validate_i32(i: i32) -> Result<(), Self::Error> {
        Self::validate_i64(i as i64)
    }

    #[inline]
    fn validate_i16(i: i16) -> Result<(), Self::Error> {
        Self::validate_i32(i as i32)
    }

    #[inline]
    fn validate_i8(i: i8) -> Result<(), Self::Error> {
        Self::validate_i16(i as i16)
    }
}