swap function is error

[7c0o]

/// swaps the contents
void swap(fifo_map& other)
{
    std::swap(m_map, other.m_map);
    std::swap(m_compare, other.m_compare);
    std::swap(m_keys, other.m_keys);
}

m_compare‘s member m_key point to m_map's m_key

[danielharvey458]

The use the of the compiler-provided copy-assignment operator is also incorrect.