Re: Initialisation of reference vs. initialisation of reference member
Tom1s wrote:
Tim Clacy posted:
1) Is this initialising the reference 'u' to the address of the
literal '2' or to the address 0x00000002?
unsigned const& u = 2;
C++ handles this under the hood as:
unsigned const literal_2 = 2;
unsigned const &u = literal_2;
2) What is the different between the initialisation of 'u' and 'S::u'
below?
unsigned const& u = 2;
struct S
{
unsigned const& u;
S() : u (2) { }
} s;
No difference. However, the global variable is far more likely to
simply be optimized to:
unsigned const u = 2;
VisualStudio 2005 generates "error C2354: 'S::u' : initialization of
reference member requires a temporary variable" but does not complain
about the initialisation of 'u'.
The code compiles without error and without warning with the G++
compiler.
When in doubt, presume Microsoft's incompetence.
-Tom1s
Thanks very much Tom1s
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