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// Copyright (c) 2012 Robert Ramey
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <iostream>
#include <limits>
#include <functional>
#include <array>
#include <boost/core/demangle.hpp>
#include <boost/safe_numerics/checked_result.hpp>
#include <boost/safe_numerics/checked_result_operations.hpp>
#include <boost/safe_numerics/interval.hpp>
template<typename T>
using fptr = T (*)(const T &, const T &);
template<typename T>
using fptr_interval = fptr<boost::safe_numerics::interval<T>>;
template<typename T>
struct op {
const fptr<T> m_f;
const fptr_interval<T> m_finterval;
const char * m_symbol;
const bool skip_zeros;
};
template<
typename T,
unsigned int N
>
bool test_type_operator(
const T (&value)[N],
const op<T> & opi
){
using namespace boost::safe_numerics;
// for each pair of values p1, p2 (100)
for(const T & l1 : value)
for(const T & u1 : value){
if(l1 > u1) continue; // skip reverse range
const interval<T> p1(l1, u1);
for(const T & l2 : value)
for(const T & u2 : value){
if(l2 > u2) continue; // skip reverse range
const interval<T> p2(l2, u2);
// maybe skip intervals which include zero
if(opi.skip_zeros){
if(l2 == safe_numerics_error::range_error
|| l2 == safe_numerics_error::domain_error
|| u2 == safe_numerics_error::range_error
|| u2 == safe_numerics_error::domain_error
|| p2.includes(T(0))
)
continue;
}
// create a new interval from the operation
const interval<T> result_interval = opi.m_finterval(p1, p2);
std::cout
<< p1 << opi.m_symbol << p2 << " -> " << result_interval << std::endl;
// if resulting interval is null
if(result_interval.u < result_interval.l)
continue;
// for each pair test values
for(const T r1 : value)
for(const T r2 : value){
// calculate result of operation
const T result = opi.m_f(r1, r2);
if(result != safe_numerics_error::range_error
&& result != safe_numerics_error::domain_error ){
// note usage of tribool logic here !!!
// includes returns indeterminate the conditional
// returns false in both cases and this is what we want.
// This is very subtle, don't skim over this.
// if both r1 and r2 are within they're respective bounds
if(p1.includes(r1) && p2.includes(r2)
&& ! result_interval.includes(result)){
#if 0
const boost::logic::tribool b1 = p1.includes(r1);
const boost::logic::tribool b2 = p2.includes(r2);
const boost::logic::tribool b3 = result_interval.includes(result);
const interval<T> result_intervalx = opi.m_finterval(p1, p2);
const T resultx = opi.m_f(r1, r2);
#endif
return false;
}
}
}
}
}
return true;
}
// values
// note: need to explicitly specify number of elements to avoid msvc failure
template<typename T>
const boost::safe_numerics::checked_result<T> value[8] = {
boost::safe_numerics::safe_numerics_error::negative_overflow_error,
std::numeric_limits<T>::lowest(),
T(-1),
T(0),
T(1),
std::numeric_limits<T>::max(),
boost::safe_numerics::safe_numerics_error::positive_overflow_error,
boost::safe_numerics::safe_numerics_error::domain_error
};
// note: need to explicitly specify number of elements to avoid msvc failure
template<typename T>
const boost::safe_numerics::checked_result<T> unsigned_value[6] = {
boost::safe_numerics::safe_numerics_error::negative_overflow_error,
T(0),
T(1),
std::numeric_limits<T>::max(),
boost::safe_numerics::safe_numerics_error::positive_overflow_error,
boost::safe_numerics::safe_numerics_error::domain_error
};
// invoke for each type
struct test_type {
unsigned int m_error_count;
test_type() :
m_error_count(0)
{}
template<typename T>
bool operator()(const T &){
using namespace boost::safe_numerics;
std::cout
<< "** testing "
<< boost::core::demangle(typeid(T).name())
<< std::endl;
using R = checked_result<T>;
// pointers to operands for types T
static const std::array<op<R>, 5> op_table{{
{operator+, operator+, "+", false},
{operator-, operator-, "-", false},
{operator*, operator*, "*", false},
{operator<<, operator<<, "<<", false},
{operator>>, operator>>, ">>", false},
}};
//for(unsigned int i = 0; i < sizeof(op_table)/sizeof(op) / sizeof(fptr<R>); ++i){
for(const op<R> & o : op_table){
if(std::is_signed<T>::value){
if(! test_type_operator(value<T>, o)){
++m_error_count;
return false;
}
}
else{
if(! test_type_operator(unsigned_value<T>, o)){
++m_error_count;
return false;
}
}
}
return true;
}
};
#include <boost/mp11/list.hpp>
#include <boost/mp11/algorithm.hpp>
int main(int, char *[]){
using namespace boost::mp11;
// list of signed types
using signed_types = mp_list<std::int8_t, std::int16_t, std::int32_t, std::int64_t>;
// list of unsigned types
using unsigned_types = mp_list<std::uint8_t, std::uint16_t, std::uint32_t, std::uint64_t>;
test_type t;
mp_for_each<unsigned_types>(t);
mp_for_each<signed_types>(t);
std::cout << (t.m_error_count == 0 ? "success!" : "failure") << std::endl;
return t.m_error_count ;
}
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