llvm-project/clang/test/SemaCXX/constant-expression-cxx1z.cpp

49 lines
1.5 KiB
C++

// RUN: %clang_cc1 -std=c++1z -verify %s -fcxx-exceptions -triple=x86_64-linux-gnu
namespace BaseClassAggregateInit {
struct A {
int a, b, c;
constexpr A(int n) : a(n), b(3 * n), c(b - 1) {} // expected-note {{outside the range of representable}}
constexpr A() : A(10) {};
};
struct B : A {};
struct C { int q; };
struct D : B, C { int k; };
constexpr D d1 = { 1, 2, 3 };
static_assert(d1.a == 1 && d1.b == 3 && d1.c == 2 && d1.q == 2 && d1.k == 3);
constexpr D d2 = { 14 };
static_assert(d2.a == 14 && d2.b == 42 && d2.c == 41 && d2.q == 0 && d2.k == 0);
constexpr D d3 = { A(5), C{2}, 1 };
static_assert(d3.a == 5 && d3.b == 15 && d3.c == 14 && d3.q == 2 && d3.k == 1);
constexpr D d4 = {};
static_assert(d4.a == 10 && d4.b == 30 && d4.c == 29 && d4.q == 0 && d4.k == 0);
constexpr D d5 = { __INT_MAX__ }; // expected-error {{must be initialized by a constant expression}}
// expected-note-re@-1 {{in call to 'A({{.*}})'}}
}
namespace NoexceptFunctionTypes {
template<typename T> constexpr bool f() noexcept(true) { return true; }
constexpr bool (*fp)() = f<int>;
static_assert(f<int>());
static_assert(fp());
template<typename T> struct A {
constexpr bool f() noexcept(true) { return true; }
constexpr bool g() { return f(); }
constexpr bool operator()() const noexcept(true) { return true; }
};
static_assert(A<int>().f());
static_assert(A<int>().g());
static_assert(A<int>()());
}
namespace Cxx17CD_NB_GB19 {
const int &r = 0;
constexpr int n = r;
}