lean2/src/util/exception.h

/*
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 <exception>
#include <string>

namespace lean {
class sstream;
/** \brief Base class for all Lean exceptions */
class exception : public std::exception {
protected:
    std::string m_msg;
    exception() {}
public:
    exception(char const * msg);
    exception(std::string const & msg);
    exception(sstream const & strm);
    exception(exception const & ex);
    virtual ~exception() noexcept;
    virtual char const * what() const noexcept;
};
/** \brief Exception produced by a Lean parser. */
class parser_exception : public exception {
protected:
    unsigned m_line;
    unsigned m_pos;
public:
    parser_exception(char const * msg, unsigned l, unsigned p);
    parser_exception(std::string const & msg, unsigned l, unsigned p);
    parser_exception(sstream const & strm, unsigned l, unsigned p);
    parser_exception(parser_exception const & ex);
    virtual ~parser_exception() noexcept;
    virtual char const * what() const noexcept;
    unsigned get_line() const { return m_line; }
    unsigned get_pos() const { return m_pos; }
};
/** \brief Exception used to sign that a computation was interrupted */
class interrupted : public exception {
public:
    interrupted() {}
    virtual ~interrupted() noexcept {}
    virtual char const * what() const noexcept { return "interrupted"; }
};
/** \brief Throw interrupted exception iff flag is true. */
inline void check_interrupted(bool flag) {
    if (flag)
        throw interrupted();
}
}