1// Copyright (c) 2012 Robert Ramey
2//
3// Distributed under the Boost Software License, Version 1.0. (See
4// accompanying file LICENSE_1_0.txt or copy at
5// http://www.boost.org/LICENSE_1_0.txt)
6
7#include <iostream>
8
9#include <boost/core/demangle.hpp>
10#include <boost/safe_numerics/checked_result_operations.hpp>
11#include <boost/safe_numerics/checked_integer.hpp>
12
13template<class T>
14bool test_checked_modulus(
15 T v1,
16 T v2,
17 char expected_result
18){
19 using namespace boost::safe_numerics;
20
21 const T result = v1 % v2;
22 std::cout
23 << v1 << " % " << v2 << " -> " << result
24 << std::endl;
25
26 switch(expected_result){
27 case '.':
28 case '0':
29 if(result.exception()){
30 std::cout
31 << "erroneously detected error in division"
32 << std::endl;
33 v1 % v2;
34 return false;
35 }
36 if(expected_result == '0'
37 && result != T(0)
38 ){
39 std::cout
40 << "failed to get expected zero result "
41 << std::endl;
42 v1 % v2;
43 return false;
44 }
45 return true;
46 case '-':
47 if(safe_numerics_error::negative_overflow_error == result.m_e)
48 return true;
49 break;
50 case '+':
51 if(safe_numerics_error::positive_overflow_error == result.m_e)
52 return true;
53 break;
54 case '!':
55 if(safe_numerics_error::range_error == result.m_e)
56 return true;
57 break;
58 }
59 std::cout
60 << "failed to detect error in modulus "
61 << std::hex << result << "(" << std::dec << result << ")"
62 << " != "<< v1 << " % " << v2
63 << std::endl;
64 v1 % v2;
65 return false;
66}
67
68#include "test_checked_modulus.hpp"
69
70template<typename T, typename First, typename Second>
71struct test_signed_pair {
72 bool operator()() const {
73 std::size_t i = First();
74 std::size_t j = Second();
75 std::cout << std::dec << i << ',' << j << ','
76 << "testing " << boost::core::demangle(name: typeid(T).name()) << ' ';
77 return test_checked_modulus(
78 signed_values<T>[i],
79 signed_values<T>[j],
80 signed_modulus_results[i][j]
81 );
82 };
83};
84
85template<typename T, typename First, typename Second>
86struct test_unsigned_pair {
87 bool operator()() const {
88 std::size_t i = First();
89 std::size_t j = Second();
90 std::cout << std::dec << i << ',' << j << ','
91 << "testing " << boost::core::demangle(name: typeid(T).name()) << ' ';
92 return test_checked_modulus(
93 unsigned_values<T>[i],
94 unsigned_values<T>[j],
95 unsigned_modulus_results[i][j]
96 );
97 };
98};
99
100#include <boost/mp11/algorithm.hpp>
101
102int main(){
103 using namespace boost::mp11;
104
105 bool rval = true;
106
107 std::cout << "*** testing signed values\n";
108 mp_for_each<
109 mp_product<
110 test_signed_pair,
111 signed_test_types,
112 signed_value_indices,
113 signed_value_indices
114 >
115 >(f: [&](auto I){
116 rval &= I();
117 });
118
119 std::cout << "*** testing unsigned values\n";
120 mp_for_each<
121 mp_product<
122 test_unsigned_pair,
123 unsigned_test_types,
124 unsigned_value_indices, unsigned_value_indices
125 >
126 >(f: [&](auto I){
127 rval &= I();
128 });
129
130 std::cout << (rval ? "success!" : "failure") << std::endl;
131 return rval ? 0 : 1;
132}
133

source code of boost/libs/safe_numerics/test/test_checked_modulus.cpp