Viewing file:  has_trivial_constructor.C (1.39 KB) -rw-r--r--
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// { dg-do run }
#include <cassert>
struct A
{
double a;
double b;
};
union U
{
double a;
double b;
};
struct B
{
B() { }
};
struct C
: public B { };
struct D
: public A { };
struct E
{
A a;
};
struct F
{
B b;
};
template<typename T>
bool
f()
{ return __has_trivial_constructor(T); }
template<typename T>
class My
{
public:
bool
f()
{ return !!__has_trivial_constructor(T); }
};
template<typename T>
class My2
{
public:
static const bool trait = __has_trivial_constructor(T);
};
template<typename T>
const bool My2<T>::trait;
template<typename T, bool b = __has_trivial_constructor(T)>
struct My3_help
{ static const bool trait = b; };
template<typename T, bool b>
const bool My3_help<T, b>::trait;
template<typename T>
class My3
{
public:
bool
f()
{ return My3_help<T>::trait; }
};
#define PTEST(T) (__has_trivial_constructor(T) && f<T>() \
&& My<T>().f() && My2<T>::trait && My3<T>().f())
#define NTEST(T) (!__has_trivial_constructor(T) && !f<T>() \
&& !My<T>().f() && !My2<T>::trait && !My3<T>().f())
int main()
{
assert (PTEST (int));
assert (NTEST (int (int)));
assert (NTEST (void));
assert (PTEST (A));
assert (PTEST (U));
assert (NTEST (B));
assert (NTEST (C));
assert (PTEST (D));
assert (PTEST (D[]));
assert (PTEST (E));
assert (NTEST (F));
return 0;
}
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