lean2/src/library/io_state_stream.h

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include "library/io_state.h"
namespace lean {
/**
\brief Base class for \c regular and \c diagnostic wrapper classes.
*/
class io_state_stream {
protected:
environment const & m_env;
io_state const & m_io_state;
public:
io_state_stream(environment const & env, io_state const & s):m_env(env), m_io_state(s) {}
virtual std::ostream & get_stream() const = 0;
void flush() { get_stream().flush(); }
formatter get_formatter() const { return m_io_state.get_formatter(); }
options get_options() const { return m_io_state.get_options(); }
environment const & get_environment() const { return m_env; }
};
/**
\brief Wrapper for the io_state object that provides access to the
io_state's regular channel
*/
class regular : public io_state_stream {
public:
regular(environment const & env, io_state const & s):io_state_stream(env, s) {}
std::ostream & get_stream() const { return m_io_state.get_regular_channel().get_stream(); }
};
/**
\brief Wrapper for the io_state object that provides access to the
io_state's diagnostic channel
*/
class diagnostic : public io_state_stream {
public:
diagnostic(environment const & env, io_state const & s):io_state_stream(env, s) {}
std::ostream & get_stream() const { return m_io_state.get_diagnostic_channel().get_stream(); }
};
// hack for using std::endl with channels
struct endl_class { endl_class() {} };
const endl_class endl;
class kernel_exception;
io_state_stream const & operator<<(io_state_stream const & out, endl_class);
io_state_stream const & operator<<(io_state_stream const & out, expr const & e);
io_state_stream const & operator<<(io_state_stream const & out, kernel_exception const & ex);
template<typename T> io_state_stream const & operator<<(io_state_stream const & out, T const & t) {
out.get_stream() << t;
return out;
}
}