ConstructHelper.h

//
// Copyright 2024 - 2025 (C). Alex Robenko. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#pragma once
 
#include "comms/CompileControl.h"
 
#include <iterator>
 
#if COMMS_HAS_CPP20_SPAN
#include <span>
#endif // #if COMMS_HAS_CPP20_SPAN
 
namespace comms
{
 
namespace util
{
 
namespace details
{
 
template <typename T>
class ConstructHelper
{
public:
    using RetType = T;
 
    template <typename TIter>
    static RetType construct(TIter from, TIter to)
    {
        return RetType(from, to);
    }
};
 
#if COMMS_HAS_CPP20_SPAN
template <typename T, std::size_t TExtent>
class ConstructHelper<std::span<T, TExtent>>
{
public:
    using RetType = std::span<T, TExtent>;
 
    template <typename TIter>
    static RetType construct(TIter from, TIter to)
    {
        return RetType(&(*from), static_cast<typename RetType::size_type>(std::distance(from, to)));
    }
};
#endif // #if COMMS_HAS_CPP20_SPAN
 
} // namespace details
 
} // namespace util
 
} // namespace comms