string - c++ large file performance with char* and pitfalls -

i'm writing , manipulating massive text files (180+mb). , i'm trying come memory schema handle data.

bigfile.txt \r delimited list of strings.

my current idea preform:

std::string str; std::ifstream in2("bigfile.txt", std::ios::binary); if (in2.is_open()) {     in2.seekg(0, std::ios::end);     str.reserve(in2.tellg());     in2.seekg(0, std::ios::beg);     str.assign((std::istreambuf_iterator<char>(in2)),     std::istreambuf_iterator<char>()); }  for(size_t = 0; < str.size();i++) {     if (str[i] == '\r')     {         str[i] = 0;     } } 

then go through list , map vector of char* string.

is there downfalls of design?

and long don't delete char*'s shouldn't leak memory right? cause string loose scope , clear correct?