resizable_memory_response.hpp

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// Copyright (c) 2026 Contributors to the Eclipse Foundation
//
// See the NOTICE file(s) distributed with this work for additional
// information regarding copyright ownership.
//
// This program and the accompanying materials are made available under the
// terms of the Apache Software License 2.0 which is available at
// https://www.apache.org/licenses/LICENSE-2.0, or the MIT license
// which is available at https://opensource.org/licenses/MIT.
//
// SPDX-License-Identifier: Apache-2.0 OR MIT
 
#ifndef IOX2_RESIZABLE_MEMORY_RESPONSE_HPP
#define IOX2_RESIZABLE_MEMORY_RESPONSE_HPP
 
#include "iox2/deployment/iceoryx2_cxx_feature_flags.hpp"
 
#if IOX2_FEATURE_FLATBUFFERS
 
#include <flatbuffers/allocator.h>
 
#include "iox2/internal/iceoryx2.hpp"
#include "iox2/service_type.hpp"
 
namespace iox2 {
template <ServiceType, typename, typename, typename, typename>
class ActiveRequest;
 
namespace internal {
template <ServiceType Service>
class ResizableMemoryResponse : public flatbuffers::Allocator {
  public:
    ResizableMemoryResponse(const ResizableMemoryResponse&) = delete;
    ResizableMemoryResponse(ResizableMemoryResponse&&) noexcept;
    ~ResizableMemoryResponse() override;
 
    auto operator=(const ResizableMemoryResponse&) noexcept -> ResizableMemoryResponse& = delete;
    auto operator=(ResizableMemoryResponse&&) noexcept -> ResizableMemoryResponse&;
 
    auto allocate(size_t size) -> uint8_t* override;
 
    void deallocate(uint8_t* ptr, size_t size) override;
 
    auto reallocate_downward(uint8_t* old_p, size_t old_size, size_t new_size, size_t in_use_back, size_t in_use_front)
        -> uint8_t* override;
 
    auto len() const -> size_t;
    auto reserved_header_len() const -> size_t;
    auto as_ptr() const -> const uint8_t*;
 
  private:
    template <ServiceType, typename, typename, typename, typename>
    friend class iox2::ActiveRequest;
 
    explicit ResizableMemoryResponse(iox2_resizable_memory_response_h handle);
    void drop();
 
    iox2_resizable_memory_response_h m_handle = nullptr;
    bool m_has_allocated = false;
    uint8_t* m_ptr = nullptr;
};
} // namespace internal
} // namespace iox2
 
#endif // IOX2_FEATURE_FLATBUFFERS
 
#endif // IOX2_RESIZABLE_MEMORY_RESPONSE_HPP