/usr/include/tins/small_uint.h is in libtins-dev 3.4-2+b1.
This file is owned by root:root, with mode 0o644.
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* Copyright (c) 2016, Matias Fontanini
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef TINS_SMALL_UINT_H
#define TINS_SMALL_UINT_H
#include <stdint.h>
#include <stdexcept>
namespace Tins {
class value_too_large : public std::exception {
public:
const char* what() const throw() {
return "Value is too large";
}
};
/**
* \class small_uint
* \brief Represents a field of <i>n</i> bits.
*
* This finds the best integral type of at least <i>n</i> bits and
* uses it to store the wrapped value.
*/
template<size_t n>
class small_uint {
private:
template<bool cond, typename OnTrue, typename OnFalse>
struct if_then_else {
typedef OnTrue type;
};
template<typename OnTrue, typename OnFalse>
struct if_then_else<false, OnTrue, OnFalse> {
typedef OnFalse type;
};
template<size_t i>
struct best_type {
typedef typename if_then_else<
(i <= 8),
uint8_t,
typename if_then_else<
(i <= 16),
uint16_t,
typename if_then_else<
(i <= 32),
uint32_t,
uint64_t
>::type
>::type
>::type type;
};
template<uint64_t base, uint64_t pow>
struct power {
static const uint64_t value = base * power<base, pow - 1>::value;
};
template<uint64_t base>
struct power<base, 0> {
static const uint64_t value = 1;
};
public:
/**
* The type used to store the value.
*/
typedef typename best_type<n>::type repr_type;
/**
* The maximum value this class can hold.
*/
static const repr_type max_value = power<2, n>::value - 1;
/**
* Value initializes the value.
*/
small_uint() : value() {}
/**
* \brief Copy constructs the stored value.
*
* This throws a value_too_large exception if the value provided
* is larger than max_value.
*
* \param val The parameter from which to copy construct.
*/
small_uint(repr_type val) {
if (val > max_value) {
throw value_too_large();
}
value = val;
}
/**
* User defined conversion to repr_type.
*/
operator repr_type() const {
return value;
}
private:
repr_type value;
};
} // Tins
#endif // TINS_SMALL_UINT_H
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