`auto` specifier type deduction for references

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Use auto&:

auto& ref_bigclass = GetBigClass();

References are supposed to be transparent: any operation on them happens on the object they refer to, there is no way to ‘get’ reference itself.

UPD: This is covered in 7.1.6.4/6:

Once the type of a declarator-id has been determined according to 8.3, the type of the declared variable using the declarator-id is determined from the type of its initializer using the rules for template argument deduction.

And template argument deduction is defined in 14.8.2.1/3:

If template parameter type P is a reference type, the type referred to by P is used for type deduction.

P.S. Note that this is different for decltype: decltype(rx) will yield int& type (7.1.6.2/4).

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