cffb0dd54d
They can get stale at use time because of updates from other recursive specializations. Instead, rely on the existence of previous declarations to add the specialization. Differential Revision: https://reviews.llvm.org/D87853
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
// RUN: %clang_cc1 -verify -std=c++1y %s
|
|
|
|
namespace PR17846 {
|
|
template <typename T> constexpr T pi = T(3.14);
|
|
template <typename T> constexpr T tau = 2 * pi<T>;
|
|
constexpr double tau_double = tau<double>;
|
|
static_assert(tau_double == 6.28, "");
|
|
}
|
|
|
|
namespace PR17848 {
|
|
template<typename T> constexpr T var = 12345;
|
|
template<typename T> constexpr T f() { return var<T>; }
|
|
constexpr int k = f<int>();
|
|
static_assert(k == 12345, "");
|
|
}
|
|
|
|
namespace NonDependent {
|
|
template<typename T> constexpr T a = 0;
|
|
template<typename T> constexpr T b = a<int>;
|
|
static_assert(b<int> == 0, "");
|
|
}
|
|
|
|
namespace InstantiationDependent {
|
|
int f(int);
|
|
void f(char);
|
|
|
|
template<int> constexpr int a = 1;
|
|
template<typename T> constexpr T b = a<sizeof(sizeof(f(T())))>; // expected-error {{invalid application of 'sizeof' to an incomplete type 'void'}}
|
|
|
|
static_assert(b<int> == 1, "");
|
|
static_assert(b<char> == 1, ""); // expected-note {{in instantiation of}} expected-error {{not an integral constant}}
|
|
|
|
template<typename T> void f() {
|
|
static_assert(a<sizeof(sizeof(f(T())))> == 0, ""); // expected-error {{static_assert failed}}
|
|
}
|
|
}
|
|
|
|
namespace PR24483 {
|
|
template<typename> struct A;
|
|
template<typename... T> A<T...> models;
|
|
template<> struct B models<>; // expected-error {{incomplete type 'struct B'}} expected-note {{forward declaration}}
|
|
}
|
|
|
|
namespace InvalidInsertPos {
|
|
template<typename T, int N> T v;
|
|
template<int N> decltype(v<int, N-1>) v<int, N>;
|
|
template<> int v<int, 0>;
|
|
int k = v<int, 500>;
|
|
}
|