On 14 November 2013 04:22, Edward Diener wrote:
On 11/13/2013 5:37 PM, Jonathan Wakely wrote:
You can use an explicit conversion, e.g. (long)0xffffffff
Or my own preference of 'static_cast<long>(0xffffffff)'. But using
Yep, that's equivalent, and arguably clearer and cleaner.
'0xffffffffL' does not work. I admit that understanding the C++ Standard's different interprtetation of these two forms is beyond me.
The expression static_cast<long>(0xffffffff) has type long, the expression 0xffffffff has a type given by [lex.icon], which on a 32-bit system will be unsigned long. Using that expression as a non-type template argument (14.3.2 [temp.arg.nontype] p5) requires no conversion for the former, but requires an implicit conversion from unsigned long to long in the latter case, and since the value would change that is a narrowing conversion, which is not allowed in a converted constant expression (5.19 [expr.const] p3).