Viewing file:  constexpr-diag3.C (1.58 KB) -rw-r--r--
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// PR c++/45923
// { dg-do compile { target c++11 } }
int f(int);
template <class T>
constexpr T g(T t) { return f(t); } // { dg-error "f.int" }
int main()
{
constexpr int i = g(1); // { dg-error "g.T" }
}
// --------------------
struct complex // { dg-message "no .constexpr. constructor" "" { target { ! implicit_constexpr } } }
{
complex(double r, double i) : re(r), im(i) { }
constexpr double real() const { return re; } // { dg-error "not a literal type" "" { target c++11_only } }
double imag() const { return im; }
private:
double re;
double im;
};
constexpr complex co1(0, 1); // { dg-error "19:the type .const complex. of .constexpr. variable .co1. is not literal" "" { target { ! implicit_constexpr } } }
constexpr double dd2 = co1.real(); // { dg-error "|in .constexpr. expansion of " "" { target { ! implicit_constexpr } } }
// --------------------
struct base // { dg-message "no .constexpr. constructor" "" { target { ! implicit_constexpr } } }
{
int _M_i;
base() : _M_i(5) { }
};
struct derived : public base // { dg-message "base class" "" { target { ! implicit_constexpr } } }
{
constexpr derived(): base() { } // { dg-error "non-.constexpr. function" "" { target { ! implicit_constexpr } } }
};
constexpr derived obj; // { dg-error "not literal" "" { target { ! implicit_constexpr } } }
// --------------------
struct Def
{
int _M_i; // { dg-message "does not initialize" }
constexpr Def() = default; // { dg-error "implicit declaration is not .constexpr." "" { target c++17_down } }
};
constexpr Def defobj; // { dg-error "uninitialized" }
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