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use crate::write::ext_write::ExtWrite;
use std::io;
use std::fmt;
use std::io::Write;

///Unchangeable `Trait Write`.
pub trait ImMutWrite<'a> {
     fn write(&'a self, buf: &[u8]) -> io::Result<usize>;
     fn flush(&'a self) -> io::Result<()>;
     fn write_all(&'a self, buf: &[u8]) -> io::Result<()>;
     fn write_fmt(&'a self, fmt: fmt::Arguments) -> io::Result<()>;
}

impl<'a, E: ExtWrite<'a>> ImMutWrite<'a> for E {
     #[inline(always)]
     fn write(&'a self, buf: &[u8]) -> io::Result<usize> {
          self.lock_fn(|mut a| a.write(buf))
     }

     #[inline(always)]
     fn flush(&'a self) -> io::Result<()> {
          self.lock_fn(|mut a| a.flush())
     }

     #[inline(always)]
     fn write_all(&'a self, buf: &[u8]) -> io::Result<()> {
          self.lock_fn(|mut a| a.write_all(buf))
     }

     #[inline(always)]
     fn write_fmt(&'a self, fmt: fmt::Arguments) -> io::Result<()> { 
          self.lock_fn(|mut a| a.write_fmt(fmt))
     }
}