add missing include

ThirdParty/osmium/util/double.hpp

@@ -0,0 +1,91 @@
+#ifndef OSMIUM_UTIL_DOUBLE_HPP
+#define OSMIUM_UTIL_DOUBLE_HPP
+
+/*
+
+This file is part of Osmium (http://osmcode.org/libosmium).
+
+Copyright 2013,2014 Jochen Topf <jochen@topf.org> and others (see README).
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+*/
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstdio>
+
+namespace osmium {
+
+    namespace util {
+
+        constexpr int max_double_length = 20; // should fit any double
+
+        /**
+         * Write double to iterator, removing superfluous '0' characters at
+         * the end. The decimal dot will also be removed if necessary.
+         *
+         * @tparam T iterator type
+         * @param iterator output iterator
+         * @param value the value that should be written
+         * @param precision max number of digits after the decimal point (must be <= 17)
+         */
+        template <typename T>
+        inline T double2string(T iterator, double value, int precision) {
+            assert(precision <= 17);
+
+            char buffer[max_double_length];
+
+#ifndef _MSC_VER
+            int len = snprintf(buffer, max_double_length, "%.*f", precision, value);
+#else
+            int len = _snprintf(buffer, max_double_length, "%.*f", precision, value);
+#endif
+            assert(len > 0 && len < max_double_length);
+
+            while (buffer[len-1] == '0') --len;
+            if (buffer[len-1] == '.') --len;
+
+            return std::copy_n(buffer, len, iterator);
+        }
+
+        /**
+         * Write double to string, removing superfluous '0' characters at
+         * the end. The decimal dot will also be removed if necessary.
+         *
+         * @param out string
+         * @param value the value that should be written
+         * @param precision max number of digits after the decimal point
+         */
+        inline void double2string(std::string& out, double value, int precision) {
+            double2string(std::back_inserter(out), value, precision);
+        }
+
+    } // namespace util
+
+} // namespace osmium
+
+#endif // OSMIUM_UTIL_DOUBLE_HPP