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// SPDX-License-Identifier: LGPL-3.0-or-later
// Author: Kristian Lytje
#pragma once
#include <string>
#include <sstream>
#include <iomanip>
namespace ausaxs::utility {
/**
* @brief Print an element with the given width.
*/
template<typename T>
struct print_element {
print_element(const T& t, int width) : t(t), width(width) {}
friend std::ostream& operator<<(std::ostream& os, const print_element<T> e) noexcept {
std::ios state(nullptr);
state.copyfmt(os);
std::stringstream ss; ss << e.t;
std::string val = ss.str();
if (val.size() > e.width) {val = val.substr(0, e.width);}
os << std::left << std::setw(e.width) << e.t;
os.copyfmt(state);
return os;
}
T t;
unsigned int width;
};
/**
* @brief Check if two numbers are approximately equal.
*
* @param v1 First value.
* @param v2 Second value.
* @param abs Absolute tolerance.
* @param eps Relative tolerance.
*/
bool approx(double v1, double v2, double abs = 1e-6, double eps = 0.01);
/**
* @brief Check if three values are equal.
*/
bool equal(double a, double b, double c);
/**
* @brief Get a unique identifier.
*/
std::string uid();
/**
* @brief Append a unique identifier to a string.
*/
std::string uid(const std::string& s);
/**
* @brief Round a number to a string.
*/
std::string round(double val, unsigned int decimals) noexcept;
namespace detail {
// Dummy object for fixed-length printing of numbers.
// std::setprecision does *not* count leading zeros, which breaks our strict formatting.
struct __dummy {
std::string s;
};
std::ostream& operator<<(std::ostream& os, const __dummy& obj);
}
detail::__dummy fixedwidth(double number, unsigned int width);
}
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