c++ implicit conversion of string to char* matches wrong function signature -

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I am writing a program that uses c string (char *) and c ++ string (std :: string). I have separated from worry for the example given below. 

  #include & lt; Iostream & gt; #include & lt; String & gt; Hello zero (std :: string s) {std :: cout & lt; & Lt; "STRING function" & lt; & Lt; Std :: endl; } Zero hello (four * c) {std :: cout & lt; & Lt; "Chard Function" & lt; & Lt; Std :: endl; } Int main (int argc, char * argv []) {hello ("obscure"); Hi (std :: string) "string"); Hi ((four *) "charp"); Return 0; }   
 When I compile this program, I get a warning:  
  test.cpp: 14: Warning: string continuous one Conversion to dislike ?? ?? Four * one ???? Regarding the first call on   
  Hello . Program running:  
  CHAR function STRING function charge function   
 It is showing that  Hello  with the first call signature Matching  Hello (four * c) .  
 My question is, if, as a C ++ program, a string literally, ( "obscure" ) is a Std :: string, it's a  Why insert for char *  and then  Hello (four * c)  to std :: string and match  hello (std :: string s) ?  
 I know I can pragma or - Warning something out (and I can put the string * four without worrying), but I want to know why the compiler will bother this artist And if there is no way to tell it. I am compiling with G ++ 4.4.3.  
 Thank you.   
 
 
 string literals such as  "obscure"  type  std :: string  are not  std :: string  A library is the only type, which is not a language magic. The type of a string is actually  const char [n] , where  N is literal length  
 for historical reasons (backward compatibility) string literals Converting them to  char *  will convert them (violation of constipation). This built-in conversion "user defined" conversion is sent to  std :: string , which is why it calls the  char *  function and warns you < / P> 
 If you change the signature of  Hello  Hello  (const char * c) , then you probably will not have to give a warning (but still To call ' std :: string  edition, which requires a manual artist)

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