Проблема с объектом string

string str ;
sscanf( "cyberforum.ru", "%s" , str.data() );
cout << "string -> " << str.c_str() << endl;
cout << "length -> " << str.length() << endl;

const char* data() const;

string t1, t2;
string str("text1 : text2");

#include <iostream>
#include <string>
 
int main()
{
    std::string MainLine ( "text1 : text2" ), FirstWord, SecondWord;
 
    FirstWord  = MainLine.substr ( 0, MainLine.find ( " :" ) );
    SecondWord = MainLine.substr ( MainLine.find ( ": " ) + 2, MainLine.length() );
 
    std::cout << FirstWord << std::endl << SecondWord << std::endl;
 
    std::cin.get();
    return 0;
}

std::string line = "text1:text2");
std::vector<std::string> vec;
boost::split(vec, line, boost::is_any_of(";"), boost::token_compess_on);
std::string first = vec.at(0);
std::string second = vec.at(1);
std::cout << first << ' ' << second << '\n';

    string str1, str2;
    char s1[100], s2[100];
 
    sscanf("cyberforum ; ru", "%s ; %s", s1, s2);
    str1 = s1; str2 = s2;
 
    cout << str1 << ' ' << str2 << endl;

#include <iostream>
#include <sstream>
#include <string>
#include <locale>
#include <cstddef>
 
int main()
{
    typedef std::ctype<char> Ctype;
 
    Ctype::mask table[Ctype::table_size] = { Ctype::mask() };
    table[static_cast<std::size_t>(' ')] = Ctype::space;
    table[static_cast<std::size_t>(':')] = Ctype::space;
 
    std::string str = "text1 : text2";
    std::istringstream stream(str);
    stream.imbue(std::locale(stream.getloc(), new Ctype(table)));
 
    std::string t1, t2;
    stream >> t1 >> t2;
 
    std::cout << t1 << '\n' << t2 << '\n';
 
    return 0;
}