array_context.hpp

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// Copyright 2009-present 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 <bsoncxx/builder/stream/array_context-fwd.hpp> // IWYU pragma: export
#include <bsoncxx/builder/stream/key_context-fwd.hpp>
#include <bsoncxx/builder/stream/single_context-fwd.hpp>
 
#include <bsoncxx/array/value.hpp>
#include <bsoncxx/builder/concatenate.hpp>
#include <bsoncxx/builder/core.hpp>
#include <bsoncxx/builder/stream/closed_context.hpp>
#include <bsoncxx/builder/stream/helpers.hpp>
#include <bsoncxx/stdx/type_traits.hpp>
 
#include <bsoncxx/config/prelude.hpp>
 
namespace bsoncxx {
namespace v_noabi {
namespace builder {
namespace stream {

template <class base>
class array_context {
   public:
    array_context(core* core) : _core(core) {}

    template <class T>
    detail::requires_not_t<
        array_context&,
        detail::is_invocable<T, array_context<>>,
        detail::is_invocable<T, single_context>,
        detail::is_alike<T, finalize_type>>
    operator<<(T&& t) {
        _core->append(std::forward<T>(t));
        return *this;
    }

    template <typename Func>
    detail::requires_t<
        array_context&,
        detail::disjunction<detail::is_invocable<Func, array_context>, detail::is_invocable<Func, single_context>>>
    operator<<(Func&& func) {
        detail::invoke(std::forward<Func>(func), *this);
        return *this;
    }

    template <typename T>
    detail::requires_t<v_noabi::array::value, std::is_same<base, closed_context>, detail::is_alike<T, finalize_type>>
    // VS2015U1 can't resolve the name.
    operator<<(T&&) {
        return _core->extract_array();
    }

    key_context<array_context> operator<<(open_document_type const) {
        _core->open_document();
        return wrap_document();
    }

    array_context operator<<(concatenate_array array) {
        _core->concatenate(array.view());
        return *this;
    }

    array_context<array_context> operator<<(open_array_type const) {
        _core->open_array();
        return wrap_array();
    }

    base operator<<(close_array_type const) {
        _core->close_array();
        return unwrap();
    }

    operator array_context<>() {
        return array_context<>(_core);
    }

    operator single_context();
 
   private:
    base unwrap() {
        return base(_core);
    }
 
    array_context<array_context> wrap_array() {
        return array_context<array_context>(_core);
    }
 
    key_context<array_context> wrap_document() {
        return key_context<array_context>(_core);
    }
 
    core* _core;
};
 
} // namespace stream
} // namespace builder
} // namespace v_noabi
} // namespace bsoncxx
 
#include <bsoncxx/config/postlude.hpp>