Reference a temporary in msvc

It compiles because MSVC has a non-standard compliant “extension” that allows binding non-const references to temporaries.

The first example should not compile on a standards compliant compiler.

In the second example, you are taking the address of a temporary to set the value of a pointer. This should also result in an error.

Clang 3.2 produces:

error: taking the address of a temporary object of type ‘Foo’ [-Waddress-of-temporary]

while GCC 4.7.3 produces

error: taking address of temporary [-fpermissive]

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