Boost.Lexical_Cast in C++
Last Updated :
18 Apr, 2022
Boost.LexicalCast which is defined in the Library “boost/lexical_cast.hpp” provides a cast operator, boost::lexical_cast, that can convert numbers from strings to numeric types like int or double and vice versa. boost::lexical_cast is an alternative to functions like std::stoi(), std::stod(), and std::to_string(), which were added to the standard library in C++11. Now let see the Implementation of this function in a program. Examples:
Conversion
integer -> string
string- > integer
integer -> char
float- > string
Associated exceptions : If a conversion fails, an exception of type bad_lexical_cast, which is derived from bad_cast, is thrown. It throws an exception because the float 52.50 and the string “GeeksforGeeks” cannot be converted to a number of type int.
CPP
#include "boost/lexical_cast.hpp"
#include <bits/stdc++.h>
using namespace std;
using boost::lexical_cast;
using boost::bad_lexical_cast;
int main() {
int s = 23;
string s1 = lexical_cast<string>(s);
cout << s1 << endl;
array< char , 64> msg = lexical_cast<array< char , 64>>(45);
cout << msg[0] << msg[1] << endl;
int num = lexical_cast< int >("1234");
cout << num << endl;
try {
int num2 = lexical_cast< int >("52.20");
}
catch (bad_lexical_cast &e) {
cout << "Exception caught : " << e.what() << endl;
}
try {
int i = lexical_cast< int >("GeeksforGeeks");
}
catch (bad_lexical_cast &e) {
cout << "Exception caught :" << e.what() << endl;
}
return 0;
}
|
Output:-
23
45
1234
Exception caught : bad lexical cast: source type value could not be interpreted as target
Exception caught :bad lexical cast: source type value could not be interpreted as target
Reference :- http://www.boost.org/
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