/**

 * @file prpack_utils.cpp

 * An assortment of utility functions for reporting errors, checking time,

 * and working with vectors.

 */

#include "prpack_utils.h"

#ifdef PRPACK_IGRAPH_SUPPORT

#include "igraph_error.h"

#else

#include <iostream>

#endif

#include <string>

using namespace prpack;

using namespace std;

#if defined(_WIN32)

#ifndef WIN32_LEAN_AND_MEAN

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#endif

double prpack_utils::get_time() {

    LARGE_INTEGER t, freq;

    QueryPerformanceCounter(&t);

    QueryPerformanceFrequency(&freq);

    return double(t.QuadPart)/double(freq.QuadPart);

}

#else

#include <sys/types.h>

#include <sys/time.h>

double prpack_utils::get_time() {

    struct timeval t;

    gettimeofday(&t, NULL);

    return (t.tv_sec*1.0 + t.tv_usec/1000000.0);

}

#endif

// Fails and outputs 'msg' if 'condition' is false.

void prpack_utils::validate(const bool condition, const string& msg) {

    if (!condition) {

#ifdef PRPACK_IGRAPH_SUPPORT

        IGRAPH_FATALF("Internal error in PRPACK: %s", msg.c_str());

#else

        cerr << msg << endl;

        exit(-1);

#endif

    }

}

// Permute a vector.

double* prpack_utils::permute(const int length, const double* a, const int* coding) {

    double* ret = new double[length];

    for (int i = 0; i < length; ++i)

        ret[coding[i]] = a[i];

    return ret;

}