Exception.h

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/*
 * This file is part of pex_exceptions.
 *
 * Developed for the LSST Data Management System.
 * This product includes software developed by the LSST Project
 * (https://www.lsst.org).
 * See the COPYRIGHT file at the top-level directory of this distribution
 * for details of code ownership.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef LSST_PEX_EXCEPTIONS_EXCEPTION_H
#define LSST_PEX_EXCEPTIONS_EXCEPTION_H
 
#include <exception>
#include <ostream>
#include <string>
#include <vector>
 
#include "lsst/base.h"
#include "boost/current_function.hpp"
 
namespace lsst {
namespace pex {
namespace exceptions {

#define LSST_EXCEPT_HERE __FILE__, __LINE__, BOOST_CURRENT_FUNCTION

#define LSST_EXCEPT(type, ...) type(LSST_EXCEPT_HERE, __VA_ARGS__)

#define LSST_EXCEPT_ADD(e, m) e.addMessage(LSST_EXCEPT_HERE, m)

#define LSST_EARGS_TYPED char const *ex_file, int ex_line, char const *ex_func, std::string const &ex_message

#define LSST_EARGS_UNTYPED ex_file, ex_line, ex_func, ex_message

#define LSST_EXCEPTION_TYPE(t, b, c)                                                          \
    class LSST_EXPORT t : public b {                                                                      \
    public:                                                                                   \
        t(LSST_EARGS_TYPED) : b(LSST_EARGS_UNTYPED){};                                        \
        t(std::string const& message) : b(message){};                                         \
        virtual char const* getType(void) const noexcept { return #c " *"; };                 \
        virtual lsst::pex::exceptions::Exception* clone(void) const { return new t(*this); }; \
    };

struct Tracepoint {
    Tracepoint(char const* file, int line, char const* func, std::string const& message);
 
    char const* _file;  // Compiled strings only; does not need deletion
    int _line;
    char const* _func;  // Compiled strings only; does not need deletion
    std::string _message;
};
typedef std::vector<Tracepoint> Traceback;

class LSST_EXPORT Exception : public std::exception {
public:
    Exception(char const* file, int line, char const* func,
              std::string const& message);  // Should use LSST_EARGS_TYPED, but that confuses doxygen.

    explicit Exception(std::string const& message);
 
    virtual ~Exception(void) noexcept;

    void addMessage(char const* file, int line, char const* func, std::string const& message);

    Traceback const& getTraceback(void) const noexcept;

    virtual std::ostream& addToStream(std::ostream& stream) const;

    virtual char const* what(void) const noexcept;

    virtual char const* getType(void) const noexcept;

    virtual Exception* clone(void) const;
 
private:
    std::string _message;
    Traceback _traceback;
};

std::ostream& operator<<(std::ostream& stream, Exception const& e);
}
}  // namespace pex
}  // namespace lsst
 
#endif