94af9b7f13
This caches iterators, i.e. especially the end iterator when possible.
The problem:
for (auto it = begin(seq); it != end(seq); ++it)
this has to call `end(seq)` on every iteration, since the compiler is
not able to reason about the call's site effects (to bad, huh).
Instead do it like this:
for (auto it = begin(seq), end = end(seq); it != end; ++it)
caching the end iterator.
Of course, still better would be:
for (auto&& each : seq)
if all you want is value semantics.
Why `auto&&` you may ask? Because it binds to everything and never copies!
Skim the referenced proposal (that was rejected, but nevertheless) for a
detailed explanation on range-based for loops and why `auto&&` is great.
Reference:
- http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3853.htm
138 lines
4.4 KiB
C++
138 lines
4.4 KiB
C++
/*
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Copyright (c) 2014, 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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#ifndef XML_RENDERER_HPP
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#define XML_RENDERER_HPP
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#include "cast.hpp"
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#include <osrm/json_container.hpp>
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namespace osrm
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{
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namespace json
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{
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struct XMLToArrayRenderer : mapbox::util::static_visitor<>
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{
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explicit XMLToArrayRenderer(std::vector<char> &_out) : out(_out) {}
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void operator()(const String &string) const
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{
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out.push_back('\"');
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out.insert(out.end(), string.value.begin(), string.value.end());
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out.push_back('\"');
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}
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void operator()(const Number &number) const
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{
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const std::string number_string = cast::double_fixed_to_string(number.value);
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out.insert(out.end(), number_string.begin(), number_string.end());
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}
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void operator()(const Object &object) const
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{
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for (auto &&each : object.values)
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{
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if (each.first.at(0) != '_')
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{
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out.push_back('<');
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out.insert(out.end(), each.first.begin(), each.first.end());
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}
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else
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{
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out.push_back(' ');
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out.insert(out.end(), ++(each).first.begin(), each.first.end());
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out.push_back('=');
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}
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mapbox::util::apply_visitor(XMLToArrayRenderer(out), each.second);
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if (each.first.at(0) != '_')
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{
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out.push_back('/');
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out.push_back('>');
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}
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}
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}
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void operator()(const Array &array) const
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{
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for (auto &&each : array.values)
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{
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mapbox::util::apply_visitor(XMLToArrayRenderer(out), each);
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}
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}
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void operator()(const True &) const
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{
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const std::string temp("true");
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out.insert(out.end(), temp.begin(), temp.end());
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}
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void operator()(const False &) const
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{
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const std::string temp("false");
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out.insert(out.end(), temp.begin(), temp.end());
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}
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void operator()(const Null &) const
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{
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const std::string temp("null");
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out.insert(out.end(), temp.begin(), temp.end());
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}
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private:
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std::vector<char> &out;
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};
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template <class JSONObject> inline void xml_render(std::vector<char> &out, const JSONObject &object)
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{
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Value value = object;
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mapbox::util::apply_visitor(XMLToArrayRenderer(out), value);
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}
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template <class JSONObject> inline void gpx_render(std::vector<char> &out, const JSONObject &object)
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{
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// add header
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const std::string header{
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"<?xml version=\"1.0\" encoding=\"UTF-8\"?><gpx creator=\"OSRM Routing Engine\""
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" version=\"1.1\" xmlns=\"http://www.topografix.com/GPX/1/1\" xmlns:xsi=\"http:"
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"//www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.topogr"
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"afix.com/GPX/1/1 gpx.xsd\"><metadata><copyright author=\"Project OSRM\"><lice"
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"nse>Data (c) OpenStreetMap contributors (ODbL)</license></copyright></metadat"
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"a><rte>"};
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out.insert(out.end(), header.begin(), header.end());
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xml_render(out, object);
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const std::string footer{"</rte></gpx>"};
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out.insert(out.end(), footer.begin(), footer.end());
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}
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} // namespace json
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} // namespace osrm
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#endif // XML_RENDERER_HPP
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