/**
* Compares the contents of this object with the given other object.
*
* @returns 0 if they are the same, <0 if this object is smaller than
* the other or >0 if it is larger. If both objects have the
* same size returns <0 if this object is lexicographically
* before the other, >0 otherwise.
*
* @pre Must not be default constructed data_view.
*/
int compare(data_view other) const {
protozero_assert(m_data && other.m_data);
const int cmp = std::memcmp(data(), other.data(),
std::min(size(), other.size()));
if (cmp == 0) {
if (size() == other.size()) {
return 0;
}
return size() < other.size() ? -1 : 1;
}
return cmp;
}
/**
* Two data_view instances are equal if they have the same size and the
* same content.
*
* @param lhs First object.
* @param rhs Second object.
*/
inline bool operator==(const data_view& lhs, const data_view& rhs) noexcept {
return lhs.size() == rhs.size() && std::equal(lhs.data(), lhs.data() + lhs.size(), rhs.data());
}
/**
* Swap two data_view objects.
*
* @param lhs First object.
* @param rhs Second object.
*/
inline void swap(data_view& lhs, data_view& rhs) noexcept {
lhs.swap(rhs);
}
/**
* Returns true if lhs.compare(rhs) >= 0.
*
* @param lhs First object.
* @param rhs Second object.
*/
inline bool operator>=(const data_view lhs, const data_view rhs) noexcept {
return lhs.compare(rhs) >= 0;
}
/**
* Is this a valid property? Properties are valid if they were
* constructed using the non-default constructor.
*/
constexpr bool valid() const noexcept {
return m_key.data() != nullptr;
}
