155 lines
3.7 KiB
C++
155 lines
3.7 KiB
C++
/*
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Copyright (c) 2017, Project OSRM contributors
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// based on
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// https://svn.apache.org/repos/asf/mesos/tags/release-0.9.0-incubating-RC0/src/common/json.hpp
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#ifndef JSON_CONTAINER_HPP
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#define JSON_CONTAINER_HPP
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#include <mapbox/variant.hpp>
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#include <string>
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#include <unordered_map>
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#include <utility>
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#include <vector>
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namespace osrm
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{
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namespace util
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{
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/**
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* JSON types representing OSRM responses.
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*
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* The json::Value type represents the basic sum-type, implemented as a variant.
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*
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* There are two ways for destructuring such types:
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* - Either provide a visitor and use the apply_visitor function or
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* - use the get function and explicitely specify the type
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*
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* See the following documentations on variants:
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* - https://github.com/mapbox/variant
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* - http://www.boost.org/doc/libs/1_55_0/doc/html/variant.html
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*
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* And take a look at the example we provide.
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*
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* \see OSRM
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*/
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namespace json
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{
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// fwd. decls.
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struct Object;
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struct Array;
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/**
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* Typed string wrapper.
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*
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* Unwrap the type via its value member attribute.
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*/
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struct String
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{
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String() = default;
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String(const char *value_) : value{value_} {}
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String(std::string value_) : value{std::move(value_)} {}
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std::string value;
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};
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/**
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* Typed floating point number.
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*
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* Unwrap the type via its value member attribute.
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*/
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struct Number
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{
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Number() = default;
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Number(double value_) : value{value_} {}
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double value;
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};
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/**
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* Typed True.
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*/
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struct True
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{
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};
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/**
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* Typed False.
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*/
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struct False
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{
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};
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/**
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* Typed Null.
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*/
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struct Null
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{
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};
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/**
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* Typed Value sum-type implemented as a variant able to represent tree-like JSON structures.
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*
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* Dispatch on its type by either by using apply_visitor or its get function.
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*/
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using Value = mapbox::util::variant<String,
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Number,
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mapbox::util::recursive_wrapper<Object>,
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mapbox::util::recursive_wrapper<Array>,
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True,
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False,
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Null>;
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/**
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* Typed Object.
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*
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* Unwrap the key-value pairs holding type via its values member attribute.
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*/
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struct Object
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{
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std::unordered_map<std::string, Value> values;
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};
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/**
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* Typed Array.
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*
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* Unwrap the Value holding type via its values member attribute.
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*/
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struct Array
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{
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std::vector<Value> values;
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};
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} // namespace json
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} // namespace util
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} // namespace osrm
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#endif // JSON_CONTAINER_HPP
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