converting double to int

Newsgroup: comp.lang.c++

Subject: converting double to int

From: ram@...

Date: 19 Nov 2013 12:23:40 GMT



#include <iostream>

#include <ostream>



int main()

{ ::std::cout << int( 2.6 )<< '\n';

::std::cout << int{ 2.6 }<< '\n';

::std::cout << ( int )2.6 << '\n';

::std::cout << static_cast< int >( 2.6 )<< '\n'; }



Under which circumstances is which way of the above to

convert a double to an int the best style?



Are there any differences in the semantics above?



Is there yet another way to write the conversion?



PS: Oh yeah: the int{} notation forbids narrowing!

I should have compiled with -pedantic-errors!

So, int{} differs from the rest, it is not a kind of

cast or conversion, rather a compile-time assertion

of the number being not wider than int?



Is the number ?2.6? an argument or an operand in

?int{ 2.6 }?? It does not seem to be a function

call. So it is not an argument. But is this an

application of an operator? No. So it also is not

an operand? So, what is it then?

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