https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85717
--- Comment #4 from claudio daffra <daffra.claudio at gmail dot com> ---
I expect that the compiler regardless of the location of the types
always gives me the same result, error message or warning
indeed :
# case integer before double :
union
{
uint64_t integer ;
double real;
} ;
gives me error, about narrowing conversion :
prova.cpp:32:5: error: narrowing conversion of '3.3999999999999999e+0' from
'double' to 'uint64_t {aka long long unsigned int}' inside { } [-Wnarrowing]
t1 = { 1 ,"a",3.4 } ;
^
# case double before integer, compile without warning or error me :
union
{
double real;
uint64_t integer ;
} ;
and about output gives me undefined behavior about integer
t1 = { 1 ,"a",3.4 } ;
std::cout << t1.real << "\n" ;
t1 = { 1 ,"a",2 } ;
std::cout << t1.integer << "\n" ;
C:\prj>x.exe
6.6
3
3.4
4611686018427387904
however if it is a normal behavior of c++ or compiler, close it.
