refcountedstring/StringValue.cpp

#include "StringValue.h"



StringValue::StringValue(char* data) noexcept
:_data(data), _size(std::strlen(data) + 1), _refs(1)
{}

void StringValue::operator++() noexcept
{ _refs++; }

void StringValue::operator--() noexcept
{
    _refs--;
    if (_refs == 0)
    {
        delete[] _data;
        delete this;
        /* This might seem scary, but StringValues are dynamically allocated and own themselves,
         * thus when no longer referenced the object can -- and should -- commit suicide. */
    }
}

const char& StringValue::operator[](size_t index) const
{
    if (index > _size - 2)
        throw std::out_of_range("Index out of range!");
    return _data[index];
}

// reuse const operator[]
char& StringValue::operator[](size_t index)
{ return const_cast<char&>(const_cast<const StringValue*>(this)->operator[](index)); }

StringValue::operator const char*() const noexcept
{ return _data; }

size_t StringValue::size() const noexcept
{ return _size - 1; }

size_t StringValue::index_of(char* c) const
{
    size_t index = c - _data;   // this is totally safe as long as I don't do anything with it
    if (index <= this->size())  // if it is within our data it is safe to use
        return index;
    else
        throw std::invalid_argument("char* not within held data!");
}