C++ Erase(0,1); in string, removing all instances of character in file -

i have program checks "@" in 'ismemloc()' function, , if finds 1 should remove it. (this symbol first character on line, hence erase(0,1) call

#include <stdio.h> #include <iostream> #include <fstream>  using namespace std;   bool replace(std::string& str, const std::string& from, const std::string& to) {     size_t start_pos = str.find(from);     if(start_pos == std::string::npos)         return false;     str.replace(start_pos, from.length(), to);     return true; }  bool iscomment(string line){     string comment = "/";     if(line.find(comment) != string::npos){         return true;     }else{         return false;     } }  bool ismemloc(string line){     string symbol = "@";     if(line.find(symbol) != string::npos){         cout << "constant found" << endl;         //converttobinary(atoi(line.c_str));         return true;     }else{         return false;     }  }     int main( int argc, const char* argv[] ) {     string outline = "test output";     string file1 = argv[1];     cout << "before: " << file1 << endl;     replace(file1, "asm", "hack");     cout << "after: " << file1 << endl;      //input     //while read line()     ifstream infile(argv[1]);     string templine;      ofstream outfile(file1.c_str());      while (getline(infile, templine)){         if(iscomment(templine))             continue;         if(ismemloc(templine)){             templine.erase(0);             cout << templine << endl;             outfile << templine << std::endl;             continue;         }          //print terminal , pass file         cout << templine << endl;            outfile << templine << std::endl;     }      outfile.close(); } 

however, when finds character, program deleting of lines value found eg:

1 2 3 13  @12 @12 @13 2 

turns into

1 2 3 13  2 

this undesired. doing wrong?

first, had in question (which right):

templine.erase(0, 1); 

then, changed code (i suppose it's original one):

templine.erase(0); 

see reference , you'll find out count parameter defaulted std::string::npos - erases characters till end.