cppstreams 1.1.0

C++ streams in rust
Documentation 
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use std::io::{Read, Write};
use std::ops::Shr;

use super::as_read::AsRead;
use super::{Cin, IStream};
use crate::ostream::as_write::AsWrite;
use crate::ostream::into_ostream::IntoOStream;

#[inline]
fn copy_from_read_to_write(
    read: &mut impl Read,
    write: &mut impl std::io::Write,
) -> std::io::Result<()> {
    let mut buffer = [0u8; 100];

    loop {
        let read = read.read(&mut buffer[..])?;
        if read == 0 {
            break;
        }
        write.write_all(&buffer[..read])?;
    }

    Ok(())
}

macro_rules! impl_istream_into_ostream {
    ($writer:ty, $reader:ty, $($t:ident : $n:ident )*) => {
        impl<$($t : $n,)*> Shr<$writer> for $reader {
            type Output = $crate::OStream<<$writer as IntoOStream>::Writer>;

            #[inline]
            #[allow(unused_mut)]
            fn shr(mut self, mut rhs: $writer) -> Self::Output {
                let mut ostream = rhs.into_ostream();
                copy_from_read_to_write(&mut self.as_read(), &mut ostream.as_write()).unwrap();
                ostream
            }
        }

        impl<'a, $($t : $n,)*> Shr<&'a mut $writer> for $reader {
            type Output = &'a mut $writer;

            #[inline]
            #[allow(unused_mut)]
            fn shr(mut self, mut rhs: &'a mut $writer) -> Self::Output {
                copy_from_read_to_write(&mut self.as_read(), &mut rhs.as_write()).unwrap();
                rhs
            }
        }
    };
}

impl_istream_into_ostream!(crate::Cout, Cin,);
impl_istream_into_ostream!(crate::Cerr, Cin,);
impl_istream_into_ostream!(crate::StringStream, Cin,);
impl_istream_into_ostream!(crate::OStream<W>, Cin, W : Write);
impl_istream_into_ostream!(crate::Cout, crate::StringStream,);
impl_istream_into_ostream!(crate::Cerr, crate::StringStream,);
impl_istream_into_ostream!(crate::StringStream, crate::StringStream,);
impl_istream_into_ostream!(crate::OStream<W>, crate::StringStream, W : Write);
impl_istream_into_ostream!(crate::Cout, IStream<R>, R : Read);
impl_istream_into_ostream!(crate::Cerr, IStream<R>, R : Read);
impl_istream_into_ostream!(crate::StringStream, IStream<R>, R : Read);
impl_istream_into_ostream!(crate::OStream<W>, IStream<R>, R : Read W : Write);

impl_istream_into_ostream!(crate::Cout, &mut Cin,);
impl_istream_into_ostream!(crate::Cerr, &mut Cin,);
impl_istream_into_ostream!(crate::StringStream, &mut Cin,);
impl_istream_into_ostream!(crate::OStream<W>, &mut Cin, W : Write);
impl_istream_into_ostream!(crate::Cout, &mut crate::StringStream,);
impl_istream_into_ostream!(crate::Cerr, &mut crate::StringStream,);
impl_istream_into_ostream!(crate::StringStream, &mut crate::StringStream,);
impl_istream_into_ostream!(crate::OStream<W>, &mut crate::StringStream, W : Write);
impl_istream_into_ostream!(crate::Cout, &mut IStream<R>, R : Read);
impl_istream_into_ostream!(crate::Cerr, &mut IStream<R>, R : Read);
impl_istream_into_ostream!(crate::StringStream, &mut IStream<R>, R : Read);
impl_istream_into_ostream!(crate::OStream<W>, &mut IStream<R>, R : Read W : Write);