portapack-mayhem/firmware/common/utility.hpp
2015-07-08 08:39:24 -07:00

118 lines
3.1 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __UTILITY_H__
#define __UTILITY_H__
#include <type_traits>
#include <cstdint>
#include <cstddef>
#include <memory>
#include <hal.h>
#define LOCATE_IN_RAM __attribute__((section(".ramtext")))
template<typename E>
constexpr typename std::underlying_type<E>::type toUType(E enumerator) noexcept {
/* Thanks, Scott Meyers! */
return static_cast<typename std::underlying_type<E>::type>(enumerator);
}
inline uint32_t flp2(uint32_t v) {
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return v - (v >> 1);
}
uint32_t gcd(const uint32_t u, const uint32_t v);
template<class T>
inline constexpr T pow(const T base, unsigned const exponent) {
return (exponent == 0) ? 1 : (base * pow(base, exponent - 1));
}
#if defined(LPC43XX_M4)
static inline bool m4_flag_saturation() {
return __get_APSR() & (1U << 27);
}
static inline void clear_m4_flag_saturation() {
uint32_t flags = 1;
__asm volatile ("MSR APSR_nzcvqg, %0" : : "r" (flags));
}
#endif
/* Override new/delete to use Chibi/OS heap functions */
/* NOTE: Do not inline these, it doesn't work. ;-) */
void* operator new(size_t size);
void* operator new[](size_t size);
void operator delete(void* p);
void operator delete[](void* p);
namespace std {
/*! Stephan T Lavavej (STL!) implementation of make_unique, which has been accepted into the C++14 standard.
* It includes handling for arrays.
* Paper here: http://isocpp.org/files/papers/N3656.txt
*/
template<class T> struct _Unique_if {
typedef unique_ptr<T> _Single_object;
};
//! Specialization for unbound array
template<class T> struct _Unique_if<T[]> {
typedef unique_ptr<T[]> _Unknown_bound;
};
//! Specialization for array of known size
template<class T, size_t N> struct _Unique_if<T[N]> {
typedef void _Known_bound;
};
//! Specialization for normal object type
template<class T, class... Args>
typename _Unique_if<T>::_Single_object
make_unique(Args&& ... args) {
return unique_ptr<T>(new T(std::forward<Args>(args)...));
}
//! Specialization for unknown bound
template<class T>
typename _Unique_if<T>::_Unknown_bound
make_unique(size_t n) {
typedef typename remove_extent<T>::type U;
return unique_ptr<T>(new U[n]());
}
//! Deleted specialization
template<class T, class... Args>
typename _Unique_if<T>::_Known_bound
make_unique(Args&& ...) = delete;
} /* namespace std */
#endif/*__UTILITY_H__*/