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 case '+':
40 if(safe_numerics_error::positive_overflow_error == result.m_e)
41 return true;
42 case '!':
43 if(safe_numerics_error::range_error == result.m_e)
44 return true;
45 }
46 std::cout
47 << "failed to detect error in ition "
48 << std::hex << result << "(" << std::dec << result << ")"
49 << " != "<< v1 << " - " << v2
50 << std::endl;
51 v1 - v2;
52 return false;
53 }
54
55 #include "test_checked_subtract.hpp"
56
57 template<typename T, typename First, typename Second>
58 struct test_signed_pair {
operator ()test_signed_pair59 bool operator()() const {
60 std::size_t i = First();
61 std::size_t j = Second();
62 std::cout << std::dec << i << ',' << j << ','
63 << "testing " << boost::core::demangle(typeid(T).name()) << ' ';
64 return test_checked_subtract(
65 signed_values<T>[i],
66 signed_values<T>[j],
67 signed_subtraction_results[i][j]
68 );
69 };
70 };
71
72 template<typename T, typename First, typename Second>
73 struct test_unsigned_pair {
operator ()test_unsigned_pair74 bool operator()() const {
75 std::size_t i = First();
76 std::size_t j = Second();
77 std::cout << std::dec << i << ',' << j << ','
78 << "testing " << boost::core::demangle(typeid(T).name()) << ' ';
79 return test_checked_subtract(
80 unsigned_values<T>[i],
81 unsigned_values<T>[j],
82 unsigned_subtraction_results[i][j]
83 );
84 };
85 };
86
87 #include <boost/mp11/algorithm.hpp>
88
main()89 int main(){
90 using namespace boost::mp11;
91
92 bool rval = true;
93
94 std::cout << "*** testing signed values\n";
95
96 mp_for_each<
97 mp_product<
98 test_signed_pair,
99 signed_test_types,
100 signed_value_indices,
101 signed_value_indices
102 >
103 >([&](auto I){
104 rval &= I();
105 });
106
107 std::cout << "*** testing unsigned values\n";
108
109 mp_for_each<
110 mp_product<
111 test_unsigned_pair,
112 unsigned_test_types,
113 unsigned_value_indices, unsigned_value_indices
114 >
115 >([&](auto I){
116 rval &= I();
117 });
118
119 std::cout << (rval ? "success!" : "failure") << std::endl;
120 return rval ? 0 : 1;
121 }
122