1// Boost.Convert test and usage example
2// Copyright (c) 2009-2020 Vladimir Batov.
3// Use, modification and distribution are subject to the Boost Software License,
4// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
5
6#include "./test.hpp"
7
8#if !defined(BOOST_CONVERT_CXX14)
9int main(int, char const* []) { return 0; }
10#else
11
12#include <boost/convert.hpp>
13#include <boost/convert/lexical_cast.hpp>
14
15using std::string;
16using boost::convert;
17
18struct boost::cnv::by_default : boost::cnv::lexical_cast {};
19
20static
21void
22test_invalid()
23{
24 char const* str[] = { "not", "1 2", " 33", "44 ", "0x11", "7 + 5" };
25 int const size = sizeof(str) / sizeof(str[0]);
26
27 for (int k = 0; k < size; ++k)
28 {
29 boost::optional<int> const res = convert<int>(str[k]);
30 bool const failed = !res;
31
32 if (!failed)
33 {
34 printf("test::cnv::invalid() failed for: <%s><%d>\n", str[k], res.value());
35 }
36 BOOST_TEST(failed);
37 }
38}
39
40static
41void
42test_dbl_to_str()
43{
44// printf("100.00 %s\n", convert<string>( 99.999).value().c_str());
45// printf( "99.95 %s\n", convert<string>( 99.949).value().c_str());
46// printf("-99.95 %s\n", convert<string>(-99.949).value().c_str());
47// printf( "99.9 %s\n", convert<string>( 99.949).value().c_str());
48// printf( "1.00 %s\n", convert<string>( 0.999).value().c_str());
49// printf( "-1.00 %s\n", convert<string>( -0.999).value().c_str());
50// printf( "0.95 %s\n", convert<string>( 0.949).value().c_str());
51// printf( "-0.95 %s\n", convert<string>( -0.949).value().c_str());
52// printf( "1.9 %s\n", convert<string>( 1.949).value().c_str());
53// printf( "-1.9 %s\n", convert<string>( -1.949).value().c_str());
54}
55
56int
57main(int, char const* [])
58{
59 string const not_int_str = "not an int";
60 string const std_str = "-11";
61 char const* const c_str = "-12";
62 int const v00 = convert<int>(not_int_str).value_or(-1);
63 int const v01 = convert<int>( std_str).value_or(-1);
64 int const v02 = convert<int>( c_str).value_or(-1);
65
66 BOOST_TEST(v00 == -1); // Failed conversion. No throw
67 BOOST_TEST(v01 == -11);
68 BOOST_TEST(v02 == -12);
69
70 test_invalid();
71 test_dbl_to_str();
72
73 return boost::report_errors();
74}
75
76#endif
77

source code of boost/libs/convert/test/lcast_converter.cpp