Viewing file:  has_nothrow_assign.C (2.6 KB) -rw-r--r--
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// { dg-do run }
#include <cassert>
struct A
{
double a;
double b;
};
struct B
{
A a;
};
struct C
: public A { };
#if __cplusplus > 201402L
#define THROW_INT
#else
#define THROW_INT throw(int) // { dg-warning "deprecated" "" { target { c++11 && { ! c++17 } } } }
#endif
struct D
{
D& operator=(const D&) throw() { return *this; }
};
struct E
{
E& operator=(const E&) THROW_INT { return *this; }
};
struct E1
{
E1& operator=(const E1&) THROW_INT { throw int(); return *this; }
};
struct F
{
F() THROW_INT { }
};
struct G
{
G() THROW_INT { throw int(); }
};
struct H
{
H& operator=(H&) THROW_INT { return *this; }
};
struct H1
{
H1& operator=(H1&) THROW_INT { throw int(); return *this; }
};
struct I
{
I& operator=(I&) THROW_INT { return *this; }
I& operator=(const I&) throw() { return *this; }
};
struct I1
{
I1& operator=(I1&) THROW_INT { throw int(); return *this; }
I1& operator=(const I1&) throw() { return *this; }
};
struct J
{
J& operator=(J&) throw() { return *this; }
J& operator=(const J&) throw() { return *this; }
J& operator=(volatile J&) throw() { return *this; }
J& operator=(const volatile J&) throw() { return *this; }
};
struct K
{
K& operator=(K&) throw() { return *this; }
};
struct L
{
L& operator=(const L&) throw() { return *this; }
};
template<typename T>
bool
f()
{ return __has_nothrow_assign(T); }
template<typename T>
class My
{
public:
bool
f()
{ return !!__has_nothrow_assign(T); }
};
template<typename T>
class My2
{
public:
static const bool trait = __has_nothrow_assign(T);
};
template<typename T>
const bool My2<T>::trait;
template<typename T, bool b = __has_nothrow_assign(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_nothrow_assign(T) && f<T>() \
&& My<T>().f() && My2<T>::trait && My3<T>().f())
#define NTEST(T) (!__has_nothrow_assign(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 (B));
assert (PTEST (C));
assert (PTEST (C[]));
assert (PTEST (D));
assert (NTEST (E));
assert (NTEST (E1));
assert (PTEST (F));
assert (PTEST (G));
assert (NTEST (H));
assert (NTEST (H1));
assert (NTEST (I));
assert (NTEST (I1));
assert (PTEST (J));
assert (NTEST (const K));
assert (NTEST (const L));
return 0;
}
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