operator<

[Morea]

how do I write that for a class X?
I'm gonna use qSort.

bool X::operator<(const X& a)
{
return number < a.number;}

bool X::operator<(const X& a)
{
return number < a.number;}

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don't work.

/usr/include/qt4/QtCore/qalgorithms.h:118: error: passing `const X' as
`this' argument of `bool X:perator<(const X&)' discards
qualifiers