121 lines
3.1 KiB
C++
121 lines
3.1 KiB
C++
#ifndef OSMIUM_UTIL_MINMAX_HPP
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#define OSMIUM_UTIL_MINMAX_HPP
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/*
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This file is part of Osmium (https://osmcode.org/libosmium).
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Copyright 2013-2023 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 <limits>
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namespace osmium {
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template <typename T>
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inline T min_op_start_value() {
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return std::numeric_limits<T>::max();
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}
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/**
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* Class for calculating the minimum of a bunch of values.
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* Works with any numeric type.
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*
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* Usage:
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*
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* min_op<int> x;
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* x.update(27);
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* x.update(12);
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* auto min = x.get(); // 12
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*/
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template <typename T>
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class min_op {
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T m_value;
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public:
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explicit min_op(T start_value = min_op_start_value<T>()) :
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m_value(start_value) {
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}
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void update(T value) noexcept {
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if (value < m_value) {
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m_value = value;
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}
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}
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T operator()() const noexcept {
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return m_value;
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}
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};
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template <typename T>
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inline T max_op_start_value() {
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return std::numeric_limits<T>::min();
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}
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/**
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* Class for calculating the maximum of a bunch of values.
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* Works with any numeric type.
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*
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* Usage:
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*
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* max_op<int> x;
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* x.update(27);
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* x.update(12);
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* auto max = x.get(); // 27
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*/
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template <typename T>
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class max_op {
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T m_value;
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public:
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explicit max_op(T start_value = max_op_start_value<T>()) :
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m_value(start_value) {
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}
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void update(T value) noexcept {
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if (value > m_value) {
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m_value = value;
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}
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}
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T operator()() const noexcept {
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return m_value;
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}
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};
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} // namespace osmium
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#endif // OSMIUM_UTIL_MINMAX_HPP
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