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// test constructors
8
9#include <iostream>
10
11#include <boost/safe_numerics/safe_compare.hpp>
12#include <boost/safe_numerics/safe_integer.hpp>
13
14template<class T2, class T1>
15bool test_construction(T1 t1, const char *t2_name, const char *t1_name){
16 using namespace boost::safe_numerics;
17 std::cout
18 << "testing constructions to " << t2_name << " from " << t1_name
19 << std::endl;
20 {
21 /* (1) test construction of safe<T1> from T1 type */
22 try{
23 safe<T1> s1(t1);
24 // should always arrive here!
25 }
26 catch(const std::exception &){
27 // should never, ever arrive here
28 std::cout
29 << "erroneously detected error in construction "
30 << "safe<" << t1_name << "> (" << t1_name << ")"
31 << std::endl;
32 try{
33 safe<T1> s1(t1); // try again for debugging
34 }
35 catch(const std::exception &){}
36 return false;
37 }
38 }
39 {
40 /* (2) test construction of safe<T2> from T1 type */
41 T2 t2;
42 try{
43 t2 = safe<T2>(t1);
44 if(! safe_compare::equal(t2 , t1)){
45 std::cout
46 << "failed to detect error in construction "
47 << "safe<" << t2_name << "> (" << t1_name << ")"
48 << std::endl;
49 safe<T2> s2x(t1);
50 return false;
51 }
52 }
53 catch(const std::exception &){
54 if(safe_compare::equal(t2, t1)){
55 std::cout
56 << "erroneously detected error in construction "
57 << "safe<" << t2_name << "> (" << t1_name << ")"
58 << std::endl;
59 try{
60 safe<T2> sx2(t1); // try again for debugging
61 }
62 catch(const std::exception &){}
63 return false;
64 }
65 }
66 }
67 {
68 /* (3) test construction of safe<T1> from safe<T1> type */
69 safe<T1> s1x(t1);
70 try{
71 safe<T1> s1(s1x);
72 if(! (s1 == s1x)){
73 std::cout
74 << "copy constructor altered value "
75 << "safe<" << t1_name << "> (safe<" << t1_name << ">(" << t1 << "))"
76 << std::endl;
77 //safe<T1> s1(s1x);
78 return false;
79 }
80 }
81 catch(const std::exception &){
82 // should never arrive here
83 std::cout
84 << "erroneously detected error in construction "
85 << "safe<" << t1_name << "> (safe<" << t1_name << ">(" << t1 << "))"
86 << std::endl;
87 try{
88 safe<T1> s1(t1);
89 }
90 catch(const std::exception &){}
91 return false;
92 }
93 }
94 {
95 /* (4) test construction of safe<T2> from safe<T1> type */
96 T2 t2;
97 try{
98 safe<T1> s1(t1);
99 safe<T2> s2(s1);
100 t2 = static_cast<T2>(s2);
101 if(! (safe_compare::equal(t1, t2))){
102 std::cout
103 << "failed to detect error in construction "
104 << "safe<" << t1_name << "> (safe<" << t2_name << ">(" << t1 << "))"
105 << std::endl;
106 safe<T2> s1x(t1);
107 return false;
108 }
109 }
110 catch(const std::exception &){
111 if(safe_compare::equal(t1, t2)){
112 std::cout
113 << "erroneously detected error in construction "
114 << "safe<" << t2_name << "> (safe<" << t1_name << ">(" << t1 << "))"
115 << std::endl;
116 try{
117 safe<T2> s1(t1);
118 }
119 catch(const std::exception &){}
120 return false;
121 }
122 }
123 }
124 return true;
125}
126
127#include <boost/mp11/algorithm.hpp>
128#include <boost/core/demangle.hpp>
129#include "test_values.hpp"
130
131using namespace boost::mp11;
132
133struct test {
134 bool m_error;
135 test(bool b = true) : m_error(b) {}
136 operator bool(){
137 return m_error;
138 }
139 template<typename T>
140 void operator()(const T &){
141 static_assert(mp_is_list<T>(), "must be a list of two types");
142 using T1 = mp_first<T>; // first element is a type
143 // second element is an integral constant
144 using T2 = typename mp_second<T>::value_type; // get it's type
145 constexpr T2 v2 = mp_second<T>(); // get it's value
146 m_error &= test_construction<T1>(
147 v2,
148 boost::core::demangle(name: typeid(T1).name()).c_str(),
149 boost::core::demangle(name: typeid(T2).name()).c_str()
150 );
151 }
152};
153
154template<typename T>
155using extract_value_type = typename T::value_type;
156using test_types = mp_unique<
157 mp_transform<
158 extract_value_type,
159 test_values
160 >
161>;
162
163int main(){
164 test rval(true);
165
166 mp_for_each<
167 mp_product<mp_list, test_types, test_values>
168 >(f&: rval);
169
170 std::cout << (rval ? "success!" : "failure") << std::endl;
171 return ! rval ;
172}
173

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