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
13 // note: T should be of tyme checked_result<R> for some integer type R
14 template<class T>
test_checked_subtract(T v1,T v2,char expected_result)15 bool test_checked_subtract(
16 T v1,
17 T v2,
18 char expected_result
19 ){
20 using namespace boost::safe_numerics;
21 const T result = v1 - v2;
22 std::cout
23 << v1 << " - " << v2 << " -> " << result
24 << std::endl;
25
26 switch(expected_result){
27 case '.':
28 if(result.exception()){
29 std::cout
30 << "erroneously detected error in subtraction "
31 << std::endl;
32 v1 - v2;
33 return false;
34 }
35 return true;
36 case '-':
37 if(safe_numerics_error::negative_overflow_error == result.m_e)
38 return true;
39 break;
40 case '+':
41 if(safe_numerics_error::positive_overflow_error == result.m_e)
42 return true;
43 break;
44 case '!':
45 if(safe_numerics_error::range_error == result.m_e)
46 return true;
47 break;
48 }
49 std::cout
50 << "failed to detect error in subtraction "
51 << std::hex << result << "(" << std::dec << result << ")"
52 << " != "<< v1 << " - " << v2
53 << std::endl;
54 v1 - v2;
55 return false;
56 }
57
58 #include "test_checked_subtract.hpp"
59
60 template<typename T, typename First, typename Second>
61 struct test_signed_pair {
operator ()test_signed_pair62 bool operator()() const {
63 std::size_t i = First();
64 std::size_t j = Second();
65 std::cout << std::dec << i << ',' << j << ','
66 << "testing " << boost::core::demangle(typeid(T).name()) << ' ';
67 return test_checked_subtract(
68 signed_values<T>[i],
69 signed_values<T>[j],
70 signed_subtraction_results[i][j]
71 );
72 };
73 };
74
75 template<typename T, typename First, typename Second>
76 struct test_unsigned_pair {
operator ()test_unsigned_pair77 bool operator()() const {
78 std::size_t i = First();
79 std::size_t j = Second();
80 std::cout << std::dec << i << ',' << j << ','
81 << "testing " << boost::core::demangle(typeid(T).name()) << ' ';
82 return test_checked_subtract(
83 unsigned_values<T>[i],
84 unsigned_values<T>[j],
85 unsigned_subtraction_results[i][j]
86 );
87 };
88 };
89
90 #include <boost/mp11/algorithm.hpp>
91
main()92 int main(){
93 using namespace boost::mp11;
94
95 bool rval = true;
96
97 std::cout << "*** testing signed values\n";
98
99 mp_for_each<
100 mp_product<
101 test_signed_pair,
102 signed_test_types,
103 signed_value_indices,
104 signed_value_indices
105 >
106 >([&](auto I){
107 rval &= I();
108 });
109
110 std::cout << "*** testing unsigned values\n";
111
112 mp_for_each<
113 mp_product<
114 test_unsigned_pair,
115 unsigned_test_types,
116 unsigned_value_indices, unsigned_value_indices
117 >
118 >([&](auto I){
119 rval &= I();
120 });
121
122 std::cout << (rval ? "success!" : "failure") << std::endl;
123 return rval ? 0 : 1;
124 }
125