msgpack-msgpack-c/include/msgpack/adaptor/array_ref.hpp

//
// MessagePack for C++ static resolution routine
//
// Copyright (C) 2008-2009 FURUHASHI Sadayuki
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//
#ifndef MSGPACK_TYPE_ARRAY_REF_HPP
#define MSGPACK_TYPE_ARRAY_REF_HPP

#include "msgpack/versioning.hpp"
#include "msgpack/adaptor/adaptor_base.hpp"
#include "msgpack/adaptor/check_container_size.hpp"
#include <cstring>
#include <string>

namespace msgpack {

/// @cond
MSGPACK_API_VERSION_NAMESPACE(v1) {
/// @endcond

namespace type {

template <typename T>
struct array_ref {
    array_ref() : data(nullptr) {}
    array_ref(T& t) : data(&t) {}

    T* data;

    template <typename U>
    bool operator==(array_ref<U> const& t) const {
        return *data == *t.data;
    }
    template <typename U>
    bool operator!=(array_ref<U> const& t) const {
        return !(*data == *t.data);
    }
    template <typename U>
    bool operator< (array_ref<U> const& t) const
    {
        return *data < *t.data;
    }
    template <typename U>
    bool operator> (array_ref<U> const& t) const
    {
        return *t.data < *data;
    }
    template <typename U>
    bool operator<= (array_ref<U> const& t) const
    {
        return !(*t.data < *data);
    }
    template <typename U>
    bool operator>= (array_ref<U> const& t) const
    {
        return !(*data < *t.data);
    }
};

template <typename T>
inline array_ref<T const> make_array_ref(T const& t) {
    return array_ref<T const>(t);
}

template <typename T>
inline array_ref<T> make_array_ref(T& t) {
    return array_ref<T>(t);
}


} // namespace type

namespace adaptor {

template <typename T>
struct convert<msgpack::type::array_ref<T> > {
    msgpack::object const& operator()(msgpack::object const& o, msgpack::type::array_ref<T>& v) const {
        if (!v.data) { throw msgpack::type_error(); }
        if (o.type != msgpack::type::ARRAY) { throw msgpack::type_error(); }
        if (v.data->size() < o.via.bin.size) { throw msgpack::type_error(); }
        if (o.via.array.size > 0) {
            msgpack::object* p = o.via.array.ptr;
            msgpack::object* const pend = o.via.array.ptr + o.via.array.size;
            typename T::iterator it = v.data->begin();
            do {
                p->convert(*it);
                ++p;
                ++it;
            } while(p < pend);
        }
        return o;
    }
};

template <typename T>
struct convert<msgpack::type::array_ref<std::vector<T> > > {
    msgpack::object const& operator()(msgpack::object const& o, msgpack::type::array_ref<std::vector<T> >& v) const {
        if (!v.data) { throw msgpack::type_error(); }
        if (o.type != msgpack::type::ARRAY) { throw msgpack::type_error(); }
        v.data->resize(o.via.bin.size);
        if (o.via.array.size > 0) {
            msgpack::object* p = o.via.array.ptr;
            msgpack::object* const pend = o.via.array.ptr + o.via.array.size;
            typename std::vector<T>::iterator it = v.data->begin();
            do {
                p->convert(*it);
                ++p;
                ++it;
            } while(p < pend);
        }
        return o;
    }
};

template <typename T>
struct pack<msgpack::type::array_ref<T> > {
    template <typename Stream>
    msgpack::packer<Stream>& operator()(msgpack::packer<Stream>& o, const msgpack::type::array_ref<T>& v) const {
        if (!v.data) { throw msgpack::type_error(); }
        uint32_t size = checked_get_container_size(v.data->size());
        o.pack_array(size);
        for (typename T::const_iterator it(v.data->begin()), it_end(v.data->end());
            it != it_end; ++it) {
            o.pack(*it);
        }
        return o;
    }
};

template <typename T>
struct object_with_zone<msgpack::type::array_ref<T> > {
    void operator()(msgpack::object::with_zone& o, const msgpack::type::array_ref<T>& v) const {
        if (!v.data) { throw msgpack::type_error(); }
        o.type = msgpack::type::ARRAY;
        if (v.data->empty()) {
            o.via.array.ptr = nullptr;
            o.via.array.size = 0;
        }
        else {
            uint32_t size = checked_get_container_size(v.data->size());
            msgpack::object* p = static_cast<msgpack::object*>(o.zone.allocate_align(sizeof(msgpack::object)*size));
            msgpack::object* const pend = p + size;
            o.via.array.ptr = p;
            o.via.array.size = size;
            typename T::const_iterator it(v.data->begin());
            do {
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif // (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && !defined(__clang__)
                *p = msgpack::object(*it, o.zone);
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif // (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && !defined(__clang__)
                ++p;
                ++it;
            } while(p < pend);
        }
    }
};

} // namespace adaptor

/// @cond
} // MSGPACK_API_VERSION_NAMESPACE(v1)
/// @endcond

} // namespace msgpack

#endif // MSGPACK_TYPE_ARRAY_REF_HPP