every

every.cpp

// simple every() function
// - rlyeh. mit licensed

// @todo: during, in, when,

#pragma once
#include <map>

#ifdef EVERY_USE_OMP
#include <omp.h>
#else
#include <chrono>
#endif

template<typename T>
bool every( float time, const char *const file, int counter ) {
    using pair_type = std::pair<const char *const, int>;
    static std::map< pair_type, T > map;

#ifdef EVERY_USE_OMP
    T now( omp_get_wtime() );
#else
    T now( std::chrono::duration_cast<std::chrono::seconds>
        ( std::chrono::system_clock::now().time_since_epoch() ).count() );
#endif

    pair_type pair( file, counter );
    auto found = map.find(pair);
    return found == map.end() ?
        ( map.insert( std::pair<pair_type,T>(pair, now) ), false ) :
        ( now - found->second >= time ? (found->second = now, true) : false );
}

enum {
    second = 1,
    minute = 60
};

static inline float seconds( unsigned N = 1 ) { return second * N; }
static inline float minutes( unsigned N = 1 ) { return minute * N; }

#define every(time) every<double>( time, __FILE__, __COUNTER__ )

/*
// usage

#include <stdlib.h>
#include "every.hpp"

int main() {
    for(;;) {
        if( every(1) ) puts("1!\n");
        if( every(5) ) puts("5!\n");
    }
}
*/