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There is currently a very annoying limitation on how std::pair comparison
operators are defined, that differs from how they are defined on std::tuple:

#include <utility>

void foo() {
 std::pair<int,double> x(1, 3.0);
 std::pair<const int&,const double&> y = x;
 x == y;
}

This generates an error.

It seems this is a clear defect that could be corrected by adding
comparison operators for std::pair<A1,A2> and std::pair<B1,B2> whenever the
comparisons of A1/B1 and A2/B2 are valid.

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<div dir=3D"ltr">There is currently a very annoying limitation on how std::=
pair comparison operators are defined, that differs from how they are defin=
ed on std::tuple:<br><br>#include &lt;utility&gt;<br><br>void foo() {<br> =
=C2=A0std::pair&lt;int,double&gt; x(1, 3.0);<br> =C2=A0std::pair&lt;const i=
nt&amp;,const double&amp;&gt; y =3D x;<br> =C2=A0x =3D=3D y;<br>}<br><br>Th=
is generates an error.<br><br>It seems this is a clear defect that could be=
 corrected by adding comparison operators for std::pair&lt;A1,A2&gt; and st=
d::pair&lt;B1,B2&gt; whenever the comparisons of A1/B1 and A2/B2 are valid.=
<br><br></div>

<p></p>

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..org">std-proposals@isocpp.org</a>.<br />
Visit this group at <a href=3D"http://groups.google.com/a/isocpp.org/group/=
std-proposals/">http://groups.google.com/a/isocpp.org/group/std-proposals/<=
/a>.<br />

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