struct test{
int a=1111111;
}test;
vincentdeMacBook-Air:datasturte vincent$ g++ struct.cpp -o structpp
struct.cpp:4:6: warning: in-class initialization of non-static data member is a
C++11 extension [-Wc++11-extensions]
int a=11111111;
^
1 warning generated.
struct test{
const int a=1111111;
}test;
vincentdeMacBook-Air:datasturte vincent$ g++ struct.cpp -o structpp
struct.cpp:4:12: warning: in-class initialization of non-static data member is a
C++11 extension [-Wc++11-extensions]
const int a=11111111;
^
struct.cpp:29:4: error: cannot assign to non-static data member 'a' with
const-qualified type 'const int'
q.a=10;
~~~^
struct.cpp:4:11: note: non-static data member 'a' declared const here
const int a=11111111;
~~~~~~~~~~^~~~~~~~~~
1 warning and 1 error generated.
vincentdeMacBook-Air:datasturte vincent$ g++ struct.cpp -o structpp
struct.cpp:29:4: error: cannot assign to static data member 'a' with
const-qualified type 'const int'
q.a=10;
~~~^
struct test{
static int a=11111111;
}test;
struct.cpp:4:18: note: static data member 'a' declared const here
static const int a=11111111;
~~~~~~~~~~~~~~~~~^~~~~~~~~~
1 error generated. vincentdeMacBook-Air:datasturte vincent$ g++ struct.cpp -o structpp
struct.cpp:4:12: error: non-const static data member must be initialized out of
line
static int a=11111111;
^ ~~~~~~~~
1 error generated.
同样问题：http://*.com/questions/13662441/c11-allows-in-class-initialization-of-non-static-and-non-const-members-what-c