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This article is to share with you what to do with Expression:invalid comarator. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Scene

The functions are defined as follows:

Template struct greaterkey {/ / is used to specify sorting and decreasing in map, and increment by default in map

Bool operator () (const T & x, const T & y) const

{

Return x > y

}

}

Template struct lesskey {

Bool operator () (const T & x, const T & y) const

{

Return x < y

}

}

Solve

After vs2010, there is a strict comparison. If the two elements are equal, be sure to return false. You can see the source code of STL:

[cpp]

Template inline

Bool _ Debug_lt_pred (_ Pr _ Pred

_ Ty1& _ Left, _ Ty2& _ Right

_ Dbfile_t _ File, _ Dbline_t _ Line)

{/ / test if _ Pred (_ Left, _ Right) and _ Pred is strict weak ordering

If (! _ Pred (_ Left, _ Right))

Return (false)

Else if (_ Pred (_ Right, _ Left))

_ DEBUG_ERROR2 ("invalid operator

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