Boost--lexical_cast 一个方便安全高效的string转换库

#include "boost\lexical_cast.hpp"
#include 
#include 
#include 

using namespace std;
using boost::lexical_cast;
using boost::bad_lexical_cast;

int main()
{

// C++自带的函数不好记，且命名不统一，有些a开头有些是str开头
/*  string转成其他类型
atof     Convert string to double (function )
atoi     Convert string to integer (function )
atol     Convert string to long integer (function )
atoll    Convert string to long long integer (function )
strtod   Convert string to double (function )
strtof   Convert string to float (function )
strtol   Convert string to long integer (function )
strtold  Convert string to long double (function )
strtoll  Convert string to long long integer (function )
strtoul  Convert string to unsigned long integer (function )
strtoull Convert string to unsigned long long integer (function )
sscanf()
   
   其他类型转string需要完全不同的方法
stringstream strm;
strm << int_val;
string s = strm.str();
sprintf()
itoa  // non-standard
*/


    try
    {
        int s = 345;
// 只需要使用同一个函数就可以完成不同类型的转换
        string str = lexical_cast(s);
        str = "Message: " + lexical_cast('A') + "==" + lexical_cast(34.5);
        cout << str << endl;
//也可以转成char类型的array
        array msg = lexical_cast< array >(23456);

        s = lexical_cast("5678");
        //s = lexical_cast("56.78"); // bad_lexical_cast
        //s = lexical_cast("3456yut");  // bad_lexical_cast 
        s = lexical_cast("3456yut", 4);  //ok
        cout << s << endl;
    }
    catch(bad_lexical_cast & e)
    {
        cout << "Exception caught:" << e.what() << endl; 
    }
    
}