value.hpp

// Copyright 2014 MongoDB Inc.
//
// 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.
 
#pragma once
 
#include <cstdlib>
#include <memory>
 
#include <bsoncxx/array/view.hpp>
#include <bsoncxx/document/view.hpp>
 
#include <bsoncxx/config/prelude.hpp>
 
namespace bsoncxx {
BSONCXX_INLINE_NAMESPACE_BEGIN
namespace document {
 
class BSONCXX_API value {
   public:
    using deleter_type = void (*)(std::uint8_t*);
    using unique_ptr_type = std::unique_ptr<uint8_t[], deleter_type>;
 
    value(std::uint8_t* data, std::size_t length, deleter_type dtor);
 
    value(unique_ptr_type ptr, std::size_t length);
 
    explicit value(document::view view);
 
    value(const value&);
    value& operator=(const value&);
 
    value(value&&) noexcept = default;
    value& operator=(value&&) noexcept = default;
 
    template <typename T,
              typename std::enable_if<!std::is_same<T, typename array::view>::value, int>::type = 0>
    explicit value(const T& t) : value({}) {
        to_bson(t, *this);
    }
    template <typename T>
    value& operator=(const T& t) {
        *this = value{t};
        return *this;
    }
 
    document::view::const_iterator cbegin() const;
 
    document::view::const_iterator cend() const;
 
    document::view::const_iterator begin() const;
 
    document::view::const_iterator end() const;
 
    document::view::const_iterator find(stdx::string_view key) const;
 
    element operator[](stdx::string_view key) const;
 
    const std::uint8_t* data() const;
 
    std::size_t length() const;
 
    bool empty() const;
 
    BSONCXX_INLINE document::view view() const noexcept;
 
    BSONCXX_INLINE operator document::view() const noexcept;
 
    template <typename T>
    T get() {
        T temp{};
        from_bson(temp, this->view());
        return temp;
    }
 
    template <typename T>
    void get(T& t) {
        from_bson(t, this->view());
    }
 
    unique_ptr_type release();
 
    void reset(document::view view);
 
   private:
    unique_ptr_type _data;
    std::size_t _length{0};
};
 
#if defined(__GNUC__) && (__cplusplus >= 201709L)
// Silence false positive with g++ 10.2.1 on Debian 11.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
BSONCXX_INLINE document::view value::view() const noexcept {
    return document::view{static_cast<uint8_t*>(_data.get()), _length};
}
#if defined(__GNUC__) && (__cplusplus >= 201709L)
#pragma GCC diagnostic pop
#endif
 
BSONCXX_INLINE value::operator document::view() const noexcept {
    return view();
}
 
BSONCXX_INLINE bool operator==(const value& lhs, const value& rhs) {
    return (lhs.view() == rhs.view());
}
 
BSONCXX_INLINE bool operator!=(const value& lhs, const value& rhs) {
    return !(lhs == rhs);
}
 
 
}  // namespace document
BSONCXX_INLINE_NAMESPACE_END
}  // namespace bsoncxx
 
#include <bsoncxx/config/postlude.hpp>