5a257416ca
This rips out the Bost Spirit / Karma conversion code, using the stdlib
and lightweight alternatives instead.
The main benefit is an immense decrease in compilation times, for every
translation unit that requires the `util/cast.hpp` header.
Note: compared to the version before, there is a minor change in
behavior: the double `-0` was printed as `0` before and is now printed
as `-0`. This comes from the IEE754 standard, specifying signed zeros,
that is `+0` and `-0`. Interesting for us: JavaScript uses IEE754,
resulting in no breakage if used in arithmetic.
Small test case, left hand side was before, right hand side is now:
$ ./a.out
-1.123457 vs -1.123457
-1 vs -1
-1.3 vs -1.3
0 vs -0
0 vs 0
0 vs 0
1.3 vs 1.3
1.123457 vs 1.123457
References:
- https://en.wikipedia.org/wiki/Signed_zero
- http://www.boost.org/doc/libs/1_59_0/doc/html/boost/algorithm/trim_right_if.html
- http://www.boost.org/doc/libs/1_59_0/doc/html/boost/algorithm/is_any_of.html
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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Copyright (c) 2015, 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 CAST_HPP
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#define CAST_HPP
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#include <string>
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#include <sstream>
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#include <iomanip>
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#include <type_traits>
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#include <boost/algorithm/string/classification.hpp>
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#include <boost/algorithm/string/trim.hpp>
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namespace cast
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{
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template <typename Enumeration>
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inline auto enum_to_underlying(Enumeration const value) ->
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typename std::underlying_type<Enumeration>::type
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{
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return static_cast<typename std::underlying_type<Enumeration>::type>(value);
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}
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template <typename T, int Precision = 6> inline std::string to_string_with_precision(const T x)
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{
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static_assert(std::is_arithmetic<T>::value, "integral or floating point type required");
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std::ostringstream out;
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out << std::fixed << std::setprecision(Precision) << x;
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auto rv = out.str();
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// Javascript has no separation of float / int, digits without a '.' are integral typed
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// X.Y.0 -> X.Y
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// X.0 -> X
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boost::trim_right_if(rv, boost::is_any_of("0"));
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boost::trim_right_if(rv, boost::is_any_of("."));
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// Note:
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// - assumes the locale to use '.' as digit separator
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// - this is not identical to: trim_right_if(rv, is_any_of('0 .'))
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return rv;
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}
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}
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#endif // CAST_HPP
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