common.h

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#ifndef MF_COMMON_H_
#define MF_COMMON_H_

#include <cstddef>
#include <cassert>
#include <exception>
#include <stdexcept>

#include <ostream>

#include "ndarray/ndspan.h"
#include "debug.h"
#include "exceptions.h"


#ifndef NDEBUG

    #define MF_ASSERT_MSG(condition, msg) \
        if(!(condition)) { \
            MF_DEBUG_BACKTRACE("assertion failed: " msg); \
            std::abort(); \
        }

    #define MF_ASSERT(condition) MF_ASSERT_MSG(condition, "`" #condition "`")

    #define MF_EXPECTS_MSG(condition, msg) MF_ASSERT_MSG(condition, "precondition: " msg)
    #define MF_EXPECTS(condition) MF_EXPECTS_MSG(condition, "`" #condition "`")
        
    #define MF_ENSURES_MSG(condition, msg) MF_ASSERT_MSG(condition, "postcondition: " msg)
    #define MF_ENSURES(condition) MF_EXPECTS_MSG(condition, "`" #condition "`")

#else

    #define MF_ASSERT_MSG(condition, msg) ((void)0)
    #define MF_ASSERT(condition) ((void)0)
    #define MF_EXPECTS(condition) ((void)0)
    #define MF_EXPECTS_MSG(condition, msg) ((void)0)
    #define MF_ENSURES(condition) ((void)0)
    #define MF_ENSURES_MSG(condition, msg) ((void)0)
    
#endif


namespace mf {


using real = float;


using time_unit = std::ptrdiff_t;


using byte = std::uint8_t;



class time_span : public ndspan<1, time_unit> {
    using base = ndspan<1, time_unit>;
    
public:
    time_span() = default;
    time_span(const base& span) : base(span) { }
    time_span(time_unit start, time_unit end) :
        base{start, end} { }
    
    time_unit start_time() const { return base::start_pos().front(); }
    time_unit end_time() const { return base::end_pos().front(); }
    time_unit duration() const { return base::size(); }
};


inline std::ostream& operator<<(std::ostream& str, const time_span& span) {
    str << '[' << span.start_time() << ", " << span.end_time() << '[';
    return str;
}


}

#endif