parallel.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * All rights reserved.                                                      *
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 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
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 * 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              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_MISC_PARALLEL_H
#define VCL_MISC_PARALLEL_H
 
#include <vclib/concepts/range.h>
#include <vclib/types.h>
 
// tbb and qt conflicts: if both are linked, we need to first undef Qt's
// emit - see: https://github.com/oneapi-src/oneTBB/issues/547
#if defined(emit)
#undef emit
#define VCLIB_EMIT_REDEFINED
#endif // emit
 
// Hack to compensate lack of support for c++17 parallel algorithms by
// several compilers. We use poolSTL.
#define POOLSTL_STD_SUPPLEMENT
#if __has_include(<poolstl/poolstl.hpp>)
#include <poolstl/poolstl.hpp>
#else
#include "../../../external/poolSTL-0.3.5/include/poolstl/poolstl.hpp"
#endif
 
// Restore the definition of "emit" if it was defined before
#ifdef VCLIB_EMIT_REDEFINED
#undef VCLIB_EMIT_REDEFINED
#define emit // restore the macro definition of "emit", as it was
             // defined in gtmetamacros.h
#endif       // VCLIB_EMIT_REDEFINED
 
#include <algorithm>
 
namespace vcl {
 
template<typename Iterator, typename Lambda>
void parallelFor(Iterator&& begin, Iterator&& end, Lambda&& F)
{
    std::for_each(std::execution::par, begin, end, F);
}
 
template<typename Iterator, typename Lambda>
void parallelFor(const Iterator& begin, const Iterator& end, Lambda&& F)
{
    std::for_each(std::execution::par, begin, end, F);
}
 
template<Range Rng, typename Lambda>
void parallelFor(Rng&& r, Lambda&& F)
{
    parallelFor(std::ranges::begin(r), std::ranges::end(r), F);
}
 
template<Range Rng, typename Lambda>
void parallelFor(const Rng& r, Lambda&& F)
{
    parallelFor(std::ranges::begin(r), std::ranges::end(r), F);
}
 
} // namespace vcl
 
#endif // VCL_MISC_PARALLEL_H