RealmGrowBuffer.h

Go to the documentation of this file.

#ifndef __REALM_GROW_BUFFER__
#define __REALM_GROW_BUFFER__

namespace realm {

class GrowBuffer {
public:
    GrowBuffer(size_t capacity)
        : m_capacity(capacity),
        m_buf(capacity, '\0'),
        m_index(0)
    {}

    GrowBuffer()
        : m_capacity(0),
        m_buf(),
        m_index(0)
    {}

    void clear() {
        if (m_buf.size() > m_capacity)
            m_buf.resize(m_capacity);
        m_index = 0;
    }

    char* data() {
        return &m_buf[0];
    }

    size_t size() {
        return m_index;
    }

    size_t free() {
        return m_buf.size() - m_index;
    }

    char* prepare(size_t capacity) {
        if (free() < capacity)
            m_buf.resize(m_buf.size() + (capacity - free()));
        return &m_buf[m_index];
    }

    void commit(size_t capacity) {
        if (m_index + capacity > m_buf.size())
            return; // TODO: throw exception
        m_index += capacity;
    }

private:
    size_t          m_capacity;
    std::string     m_buf;
    size_t          m_index;
};

}

#endif /* __REALM_GROW_BUFFER__ */