EStringPool.h

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#ifndef ESTRINGPOOL_H
#define ESTRINGPOOL_H

//using namespace Borealis;        // ???
BOREALIS_NAMESPACE_BEGIN

class EStringPool {
  public:
    EStringPool(unsigned int initial_size = DEFAULT_INITIAL_SIZE) :
        _data(static_cast<char*>(malloc(initial_size))),
        _offset(0),
        _size(initial_size)
    {
        ASSERT(_size);
    }

    ~EStringPool()
    {
        reset();
        free(_data);
    }

    void reset() {
        if (!_to_delete.empty()) {
            for (vector<char*>::iterator i = _to_delete.begin(); i < _to_delete.end(); ++i)
                free(*i);

            _to_delete.clear();
        }
    }

    char *alloc(unsigned int size) {
   // Round size up to multiple of 8 bytes
   size = (size + 7) & ~7;

        if (_offset + size > _size) {
            _to_delete.push_back(_data);

            do {
                _size <<= 1;
            } while (_size < 2 * (_offset + size));

            _data = static_cast<char*>(malloc(_size));
            _offset = size;

            return _data;
        } else {
            char *ret = _data + _offset;
            _offset += size;
            return ret;
        }
    }

    static const unsigned int DEFAULT_INITIAL_SIZE = 10240;

  private:
    char *_data;
    unsigned int _offset;
    unsigned int _size;

    vector<char*> _to_delete;
};

BOREALIS_NAMESPACE_END
#endif                     // ESTRINGPOOL_H

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