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/printf.hpp>
14#include <boost/test/tools/floating_point_comparison.hpp>
15
16using std::string;
17using boost::convert;
18
19namespace cnv = boost::cnv;
20namespace arg = boost::cnv::parameter;
21
22static
23void
24test_notation()
25{
26 //[printf_notation
27 boost::cnv::printf cnv;
28
29 BOOST_TEST( "-3.14159" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::fixed)(arg::precision = 5)).value());
30 BOOST_TEST( "-3.142e+00" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::scientific)(arg::precision = 3)).value());
31 BOOST_TEST("-0x1.9220p+1" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::hex)(arg::precision = 4)).value());
32
33 const auto close = boost::math::fpc::close_at_tolerance<double>(1);
34
35 BOOST_TEST_WITH(-3.14159, convert<double>("-3.14159", cnv(arg::notation = cnv::notation::fixed)).value(), close);
36 BOOST_TEST_WITH(-3.14159, convert<double>("-3.142e+00", cnv(arg::notation = cnv::notation::scientific)).value(), close);
37 BOOST_TEST_WITH(-3.14159, convert<double>("-0x1.9220p+1", cnv(arg::notation = cnv::notation::hex)).value(), close);
38 //]
39}
40
41int
42main(int, char const* [])
43{
44 boost::cnv::printf cnv;
45
46 string const not_int_str = "not an int";
47 string const std_str = "-11";
48 char const* const c_str = "-12";
49
50 BOOST_TEST( -1 == convert<int>(not_int_str, cnv).value_or(-1));
51 BOOST_TEST(-11 == convert<int>(std_str, cnv).value_or(-1));
52 BOOST_TEST(-12 == convert<int>(c_str, cnv).value_or(-1));
53
54 BOOST_TEST( float(3.14) == convert< float>("3.14", cnv(arg::precision = 2)).value_or(-1));
55 BOOST_TEST(double(3.14) == convert<double>("3.14", cnv(arg::precision = 2)).value_or(-1));
56
57 BOOST_TEST("255" == convert<std::string>(255, cnv(arg::base = boost::cnv::base::dec)).value());
58 BOOST_TEST( "ff" == convert<std::string>(255, cnv(arg::base = boost::cnv::base::hex)).value());
59 BOOST_TEST("377" == convert<std::string>(255, cnv(arg::base = boost::cnv::base::oct)).value());
60
61 string s01 = convert<string>(12.3456, cnv(arg::precision = 6)).value();
62 string s02 = convert<string>(12.3456, cnv(arg::precision = 3)).value();
63
64 BOOST_TEST(s01 == "12.345600");
65 BOOST_TEST(s02 == "12.346");
66
67 test_notation();
68
69 return boost::report_errors();
70}
71
72#endif
73

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