c++ - Returning null char array with rewriting Java's String.toUpperCase() -


this question has answer here:

i java programmer , have deep love of syntax, regarding string object. c++, have tried recreate touppercase() method java has. problem returns string object has empty/null char array.

string string::touppercase() {     char *a = new char[this->length + 1];     memset(a, 0, this->capacity + 1);     memcpy(a, this->characters, this->length);     (int = 0; < strlen(this->characters); i++)     {         toupper(a[i]);     }     return *new string(a); }

you have few memory problems attempt, logical one. need return copy of string characters being upper case is:

std::string str = "my original string"; std::string mycopy(str); std::locale loc; std::transform(mycopy.begin(), mycopy.end(), mycopy.begin(), [&](char c) {     return std::toupper(c, loc); });

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