Viewing file:  constexpr-attribute.C (1.15 KB) -rw-r--r--
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// { dg-do compile { target c++11 } }
//A few constexpr's
constexpr int foo() { return __alignof__(int); }
template<typename T>
constexpr int fooT() { return __alignof__(T); }
template<int N>
constexpr int fooN() { return N; }
//Now the attributes
//with normal variables,
int a __attribute__((aligned(foo())));
int b __attribute__((aligned(fooT<int>())));
int c __attribute__((aligned(fooN<__alignof__(int)>())));
//with variables inside a template,
template <typename T>
void fun()
{
T a __attribute__((aligned(foo())));
T b __attribute__((aligned(fooT<T>())));
T c __attribute__((aligned(fooN<__alignof__(T)>())));
T d __attribute__((aligned(fooT<int>())));
T e __attribute__((aligned(fooN<__alignof__(int)>())));
}
//instantiate it,
void bar()
{
fun<int>();
}
//with classes
struct __attribute__((aligned(foo()))) S0
{
char dummy;
};
S0 s0;
struct __attribute__((aligned(fooT<int>()))) S1
{
char dummy;
};
S1 s1;
//and class templates
template <typename T>
struct __attribute__((aligned(foo()))) S2
{
char dummy;
};
S2<int> s2;
template <typename T>
struct __attribute__((aligned(fooT<T>()))) S3
{
char dummy;
};
S3<int> s3;
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