H5Utils.hpp

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/*
 *  Copyright (c), 2017, Adrien Devresse <adrien.devresse@epfl.ch>
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *          http://www.boost.org/LICENSE_1_0.txt)
 *
 */
#pragma once
 
// internal utilities functions
#include <algorithm>
#include <array>
#include <cstddef>  // __GLIBCXX__
#include <exception>
#include <string>
#include <type_traits>
#include <vector>
#include <sstream>
 
#include <H5public.h>
 
#include "../H5Exception.hpp"
#include "H5Friends.hpp"
 
namespace HighFive {
 
namespace details {
// converter function for hsize_t -> size_t when hsize_t != size_t
template <typename Size>
inline std::vector<std::size_t> to_vector_size_t(const std::vector<Size>& vec) {
    static_assert(!std::is_same<Size, std::size_t>::value, " hsize_t != size_t mandatory here");
    std::vector<size_t> res(vec.size());
    std::transform(vec.cbegin(), vec.cend(), res.begin(), [](Size e) {
        return static_cast<size_t>(e);
    });
    return res;
}
 
// converter function for hsize_t -> size_t when size_t == hsize_t
inline std::vector<std::size_t> to_vector_size_t(const std::vector<std::size_t>& vec) {
    return vec;
}
 
// read name from a H5 object using the specified function
template <typename T>
inline std::string get_name(T fct) {
    constexpr size_t maxLength = 255;
    std::array<char, maxLength + 1> buffer;
    ssize_t retcode = fct(buffer.data(), static_cast<hsize_t>(buffer.size()));
    if (retcode < 0) {
        HDF5ErrMapper::ToException<GroupException>("Error accessing object name");
    }
    const size_t length = static_cast<std::size_t>(retcode);
    if (length <= maxLength) {
        return std::string(buffer.data(), length);
    }
    std::vector<char> bigBuffer(length + 1, 0);
    fct(bigBuffer.data(), length + 1);
    return std::string(bigBuffer.data(), length);
}
 
template <class Container>
inline std::string format_vector(const Container& container) {
    auto sout = std::stringstream{};
 
    sout << "[ ";
    for (size_t i = 0; i < container.size(); ++i) {
        sout << container[i] << (i == container.size() - 1 ? "" : ", ");
    }
    sout << "]";
 
    return sout.str();
}
 
}  // namespace details
}  // namespace HighFive