portable_utils.h

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// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright (c) 2006-2008 Marc Brooker and Michael Inggs
// Copyright (c) 2008-present FERS Contributors (see AUTHORS.md).
//
// See the GNU GPLv2 LICENSE file in the FERS project root for more information.
 
/**
 * @file portable_utils.h
 * @brief Utility functions for mathematical and system operations.
 */
 
#pragma once
 
#include <cmath>
#include <thread>
 
#include "config.h"
 
namespace core
{
    /**
     * @brief Computes the Bessel function of the first kind (order 1) for a given value.
     *
     * @param x The value for which the Bessel function is to be computed.
     * @return The computed value of the Bessel function of the first kind (order 1).
     */
    inline RealType besselJ1(const RealType x) noexcept
    {
#ifdef _MSC_VER
        return _j1(x);
#else
        return j1(x);
#endif
    }
 
    /**
     * @brief Detects the number of CPUs on the machine.
     *
     * @return The number of CPUs detected, or 1 if detection fails.
     */
    inline unsigned countProcessors() noexcept
    {
        if (const unsigned hardware_threads = std::thread::hardware_concurrency(); hardware_threads > 0)
        {
            return hardware_threads;
        }
        LOG(logging::Level::ERROR, "Unable to get CPU count, assuming 1.");
        return 1;
    }
}