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// RUN: %clang_cc1 -std=c++2a -verify %s
template<typename, typename>
constexpr bool is_same = false;
template<typename T>
constexpr bool is_same<T, T> = true;
template<typename T>
struct DummyTemplate { };
void func() {
auto L0 = []<typename T>(T arg) {
static_assert(is_same<T, int>); // expected-error {{static assertion failed}}
};
L0(0);
L0(0.0); // expected-note {{in instantiation}}
auto L1 = []<int I> {
static_assert(I == 5); // expected-error {{static assertion failed}}
};
L1.operator()<5>();
L1.operator()<6>(); // expected-note {{in instantiation}}
auto L2 = []<template<typename> class T, class U>(T<U> &&arg) {
static_assert(is_same<T<U>, DummyTemplate<float>>); // // expected-error {{static assertion failed}}
};
L2(DummyTemplate<float>());
L2(DummyTemplate<double>()); // expected-note {{in instantiation}}
}
template<typename T> // expected-note {{declared here}}
struct ShadowMe {
void member_func() {
auto L = []<typename T> { }; // expected-error {{'T' shadows template parameter}}
}
};
template<typename T>
constexpr T outer() {
return []<T x>() { return x; }.template operator()<123>(); // expected-error {{no matching member function}} \
expected-note {{candidate template ignored}}
}
static_assert(outer<int>() == 123);
template int *outer<int *>(); // expected-note {{in instantiation}}
namespace GH62611 {
template <auto A = [](auto x){}>
struct C {
static constexpr auto B = A;
};
int test() {
C<>::B(42);
}
namespace AutoParam
{
template <auto A = [](auto x) { return x;}>
auto B = A;
static_assert(B<>(42) == 42);
}
namespace TypeParam
{
template <typename T = decltype([](auto x) {return x;})>
auto B = T{};
static_assert(B<>(42) == 42);
}
}
namespace GH64689 {
void f();
void foo() {
[]<typename T>(int)
noexcept(requires(int t) { f(); })
-> decltype(requires(int t) { f(); })
requires requires(int t) { f(); }
{return {};}.operator()<int>(0);
[](auto)
noexcept(requires(int t) { f(); })
-> decltype(requires(int t) { f(); })
requires requires(int t) { f(); }
{return {};}(1);
}
}
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