97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
#ifndef OSMIUM_UTIL_DOUBLE_HPP
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#define OSMIUM_UTIL_DOUBLE_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013-2017 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <algorithm>
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#include <cassert>
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#include <cstdio>
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#include <iterator>
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#include <string>
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namespace osmium {
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namespace util {
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constexpr const int max_double_length = 20; // should fit any double
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/**
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* Write double to iterator, removing superfluous '0' characters at
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* the end. The decimal dot will also be removed if necessary.
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*
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* @tparam T iterator type
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* @param iterator output iterator
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* @param value the value that should be written
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* @param precision max number of digits after the decimal point (must be <= 17)
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*/
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template <typename T>
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inline T double2string(T iterator, double value, int precision) {
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assert(precision <= 17);
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char buffer[max_double_length];
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#ifndef _MSC_VER
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int len = snprintf(buffer, max_double_length, "%.*f", precision, value);
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#else
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int len = _snprintf(buffer, max_double_length, "%.*f", precision, value);
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#endif
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assert(len > 0 && len < max_double_length);
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while (buffer[len - 1] == '0') {
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--len;
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}
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if (buffer[len - 1] == '.') {
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--len;
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}
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return std::copy_n(buffer, len, iterator);
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}
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/**
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* Write double to string, removing superfluous '0' characters at
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* the end. The decimal dot will also be removed if necessary.
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*
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* @param out string
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* @param value the value that should be written
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* @param precision max number of digits after the decimal point
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*/
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inline void double2string(std::string& out, double value, int precision) {
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double2string(std::back_inserter(out), value, precision);
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}
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} // namespace util
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} // namespace osmium
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#endif // OSMIUM_UTIL_DOUBLE_HPP
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