Incorrect comparison function - violates strict weak ordering

[ineedanaccounttosearch]

stackoverflown/questions/qmap-qcolor-32512125/main.cpp

Lines 4 to 8 in b3d59cf

	bool operator<(const QColor & a, const QColor & b) {
	return a.redF() < b.redF()
	|| a.greenF() < b.greenF()
	|| a.blueF() < b.blueF()
	|| a.alphaF() < b.alphaF();

This comparison function violates the requirement for Strict Weak Ordering and will cause undefined behaviour/corruption inside the map.

Consider colours A(255, 0, 0) and B(0, 255, 0). Both A < B and B < A will return true.