99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
#ifndef OSMIUM_UTIL_DOUBLE_HPP
|
|
#define OSMIUM_UTIL_DOUBLE_HPP
|
|
|
|
/*
|
|
|
|
This file is part of Osmium (https://osmcode.org/libosmium).
|
|
|
|
Copyright 2013-2023 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 <cstdio>
|
|
#include <iterator>
|
|
#include <string>
|
|
|
|
namespace osmium {
|
|
|
|
inline namespace util {
|
|
|
|
/**
|
|
* 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);
|
|
|
|
enum {
|
|
max_double_length = 20 // should fit decimal representation of any double
|
|
};
|
|
|
|
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
|