24 struct boost::cnv::by_default : boost::cnv::cstream {};
30     boost::cnv::cstream  cnv;  in example1()  local
39         int i2 = convert<int>("not an int", cnv).value_or(-1); // after the call i2==-1  in example1()
49             int i2 = convert<int>(str, cnv).value(); // Throws if the conversion fails.  in example1()
59         optional<int> r1 = convert<int>(str1, cnv); // Does not throw on conversion failure.  in example1()
60         optional<int> r2 = convert<int>(str2, cnv); // Does not throw on conversion failure.  in example1()
75         int i3 = convert<int>(str3, cnv).value_or(fallback_value);  in example1()
76         int i4 = convert<int>(str3, cnv).value_or_eval(fallback_function);  in example1()
92     boost::cnv::cstream  cnv;  in example4()  local
96     boost::optional<int> res = boost::convert<int>(str, cnv);  in example4()
106     int i2 = convert<int>(str, cnv).value_or_eval(fallback_func());  in example4()
107     int i3 = convert<int>(str, cnv, fallback_func()); // Same as above. Alternative API.  in example4()
115     boost::cnv::cstream  cnv;  in example7()  local
124     int i1 = convert<int>(str, cnv, fallback_value);  in example7()
125     int i2 = convert<int>(str, cnv, fallback_func());  in example7()
130         int i3 = convert<int>(str, cnv, boost::throw_on_failure);  in example7()
138     int m1 = convert<int>(str, cnv).value_or(fallback_value);  in example7()
139     int m2 = convert<int>(str, cnv).value_or_eval(fallback_func());  in example7()
140     int m3 = convert<int>(str, cnv).value();  in example7()