refcountedstring/Char.cpp

#include "Char.h"



Char::operator char() const
{ return _string._str->operator[](_index); }

// copy-on-write magic happens here
// provides strong exception guarantee
Char& Char::operator=(char other)
{
    auto data = new char[_string.size() + 1];   // space for old string & null-terminator
    std::strcpy(data, _string.c_str());
    data[_index] = other;                       // set the desired char


    _string._str->operator--();                 // release old StringValue
    _string._str = new StringValue(data);       // make a new one

    return *this;
}