llvm-project/clang/test/SemaCXX/enable_if.cpp

237 lines
11 KiB
C++

// RUN: %clang_cc1 -std=c++11 -verify %s
typedef int (*fp)(int);
int surrogate(int);
struct Incomplete; // expected-note{{forward declaration of 'Incomplete'}} \
// expected-note {{forward declaration of 'Incomplete'}}
struct X {
X() = default; // expected-note{{candidate constructor not viable: requires 0 arguments, but 1 was provided}}
X(const X&) = default; // expected-note{{candidate constructor not viable: no known conversion from 'bool' to 'const X' for 1st argument}}
X(bool b) __attribute__((enable_if(b, "chosen when 'b' is true"))); // expected-note{{candidate disabled: chosen when 'b' is true}}
void f(int n) __attribute__((enable_if(n == 0, "chosen when 'n' is zero")));
void f(int n) __attribute__((enable_if(n == 1, "chosen when 'n' is one"))); // expected-note{{member declaration nearly matches}} expected-note 2{{candidate disabled: chosen when 'n' is one}}
void g(int n) __attribute__((enable_if(n == 0, "chosen when 'n' is zero"))); // expected-note{{candidate disabled: chosen when 'n' is zero}}
void h(int n, int m = 0) __attribute__((enable_if(m == 0, "chosen when 'm' is zero"))); // expected-note{{candidate disabled: chosen when 'm' is zero}}
static void s(int n) __attribute__((enable_if(n == 0, "chosen when 'n' is zero"))); // expected-note2{{candidate disabled: chosen when 'n' is zero}}
void conflict(int n) __attribute__((enable_if(n+n == 10, "chosen when 'n' is five"))); // expected-note{{candidate function}}
void conflict(int n) __attribute__((enable_if(n*2 == 10, "chosen when 'n' is five"))); // expected-note{{candidate function}}
void hidden_by_argument_conversion(Incomplete n, int m = 0) __attribute__((enable_if(m == 10, "chosen when 'm' is ten")));
Incomplete hidden_by_incomplete_return_value(int n = 0) __attribute__((enable_if(n == 10, "chosen when 'n' is ten"))); // expected-note{{'hidden_by_incomplete_return_value' declared here}}
operator long() __attribute__((enable_if(true, "chosen on your platform")));
operator int() __attribute__((enable_if(false, "chosen on other platform")));
operator fp() __attribute__((enable_if(false, "never enabled"))) { return surrogate; } // expected-note{{conversion candidate of type 'int (*)(int)'}} // FIXME: the message is not displayed
};
void X::f(int n) __attribute__((enable_if(n == 0, "chosen when 'n' is zero"))) // expected-note{{member declaration nearly matches}} expected-note 2{{candidate disabled: chosen when 'n' is zero}}
{
}
void X::f(int n) __attribute__((enable_if(n == 2, "chosen when 'n' is two"))) // expected-error{{out-of-line definition of 'f' does not match any declaration in 'X'}}
{
}
X x1(true);
X x2(false); // expected-error{{no matching constructor for initialization of 'X'}}
__attribute__((deprecated)) constexpr int old() { return 0; } // expected-note2{{'old' has been explicitly marked deprecated here}}
void deprec1(int i) __attribute__((enable_if(old() == 0, "chosen when old() is zero"))); // expected-warning{{'old' is deprecated}}
void deprec2(int i) __attribute__((enable_if(old() == 0, "chosen when old() is zero"))); // expected-warning{{'old' is deprecated}}
void overloaded(int);
void overloaded(long);
struct Int {
constexpr Int(int i) : i(i) { }
constexpr operator int() const { return i; }
int i;
};
void default_argument(int n, int m = 0) __attribute__((enable_if(m == 0, "chosen when 'm' is zero"))); // expected-note{{candidate disabled: chosen when 'm' is zero}}
void default_argument_promotion(int n, int m = Int(0)) __attribute__((enable_if(m == 0, "chosen when 'm' is zero"))); // expected-note{{candidate disabled: chosen when 'm' is zero}}
struct Nothing { };
template<typename T> void typedep(T t) __attribute__((enable_if(t, ""))); // expected-note{{candidate disabled:}} expected-error{{value of type 'Nothing' is not contextually convertible to 'bool'}}
template<int N> void valuedep() __attribute__((enable_if(N == 1, "")));
// FIXME: we skip potential constant expression evaluation on value dependent
// enable-if expressions
int not_constexpr();
template<int N> void valuedep() __attribute__((enable_if(N == not_constexpr(), "")));
template <typename T> void instantiationdep() __attribute__((enable_if(sizeof(sizeof(T)) != 0, "")));
void test() {
X x;
x.f(0);
x.f(1);
x.f(2); // expected-error{{no matching member function for call to 'f'}}
x.f(3); // expected-error{{no matching member function for call to 'f'}}
x.g(0);
x.g(1); // expected-error{{no matching member function for call to 'g'}}
x.h(0);
x.h(1, 2); // expected-error{{no matching member function for call to 'h'}}
x.s(0);
x.s(1); // expected-error{{no matching member function for call to 's'}}
X::s(0);
X::s(1); // expected-error{{no matching member function for call to 's'}}
x.conflict(5); // expected-error{{call to member function 'conflict' is ambiguous}}
x.hidden_by_argument_conversion(10); // expected-error{{argument type 'Incomplete' is incomplete}}
x.hidden_by_incomplete_return_value(10); // expected-error{{calling 'hidden_by_incomplete_return_value' with incomplete return type 'Incomplete'}}
deprec2(0);
overloaded(x);
default_argument(0);
default_argument(1, 2); // expected-error{{no matching function for call to 'default_argument'}}
default_argument_promotion(0);
default_argument_promotion(1, 2); // expected-error{{no matching function for call to 'default_argument_promotion'}}
int i = x(1); // expected-error{{no matching function for call to object of type 'X'}}
Nothing n;
typedep(0); // expected-error{{no matching function for call to 'typedep'}}
typedep(1);
typedep(n); // expected-note{{in instantiation of function template specialization 'typedep<Nothing>' requested here}}
}
template <typename T> class C {
void f() __attribute__((enable_if(T::expr == 0, ""))) {}
void g() { f(); }
};
int fn3(bool b) __attribute__((enable_if(b, "")));
template <class T> void test3() {
fn3(sizeof(T) == 1);
}
template <typename T>
struct Y {
T h(int n, int m = 0) __attribute__((enable_if(m == 0, "chosen when 'm' is zero"))); // expected-note{{candidate disabled: chosen when 'm' is zero}}
};
void test4() {
Y<int> y;
int t0 = y.h(0);
int t1 = y.h(1, 2); // expected-error{{no matching member function for call to 'h'}}
}
// FIXME: issue an error (without instantiation) because ::h(T()) is not
// convertible to bool, because return types aren't overloadable.
void h(int);
template <typename T> void outer() {
void local_function() __attribute__((enable_if(::h(T()), "")));
local_function();
};
namespace PR20988 {
struct Integer {
Integer(int);
};
int fn1(const Integer &) __attribute__((enable_if(true, "")));
template <class T> void test1() {
int &expr = T::expr();
fn1(expr);
}
int fn2(const Integer &) __attribute__((enable_if(false, ""))); // expected-note{{candidate disabled}}
template <class T> void test2() {
int &expr = T::expr();
fn2(expr); // expected-error{{no matching function for call to 'fn2'}}
}
int fn3(bool b) __attribute__((enable_if(b, "")));
template <class T> void test3() {
fn3(sizeof(T) == 1);
}
}
namespace FnPtrs {
int ovlFoo(int m) __attribute__((enable_if(m > 0, "")));
int ovlFoo(int m);
void test() {
// Assignment gives us a different code path than declarations, and `&foo`
// gives us a different code path than `foo`
int (*p)(int) = ovlFoo;
int (*p2)(int) = &ovlFoo;
int (*a)(int);
a = ovlFoo;
a = &ovlFoo;
}
int ovlBar(int) __attribute__((enable_if(true, "")));
int ovlBar(int m) __attribute__((enable_if(false, "")));
void test2() {
int (*p)(int) = ovlBar;
int (*p2)(int) = &ovlBar;
int (*a)(int);
a = ovlBar;
a = &ovlBar;
}
int ovlConflict(int m) __attribute__((enable_if(true, "")));
int ovlConflict(int m) __attribute__((enable_if(1, "")));
void test3() {
int (*p)(int) = ovlConflict; // expected-error{{address of overloaded function 'ovlConflict' is ambiguous}} expected-note@191{{candidate function}} expected-note@192{{candidate function}}
int (*p2)(int) = &ovlConflict; // expected-error{{address of overloaded function 'ovlConflict' is ambiguous}} expected-note@191{{candidate function}} expected-note@192{{candidate function}}
int (*a)(int);
a = ovlConflict; // expected-error{{assigning to 'int (*)(int)' from incompatible type '<overloaded function type>'}} expected-note@191{{candidate function}} expected-note@192{{candidate function}}
a = &ovlConflict; // expected-error{{assigning to 'int (*)(int)' from incompatible type '<overloaded function type>'}} expected-note@191{{candidate function}} expected-note@192{{candidate function}}
}
template <typename T>
T templated(T m) __attribute__((enable_if(true, ""))) { return T(); }
template <typename T>
T templated(T m) __attribute__((enable_if(false, ""))) { return T(); }
void test4() {
int (*p)(int) = templated<int>;
int (*p2)(int) = &templated<int>;
int (*a)(int);
a = templated<int>;
a = &templated<int>;
}
template <typename T>
T templatedBar(T m) __attribute__((enable_if(m > 0, ""))) { return T(); }
void test5() {
int (*p)(int) = templatedBar<int>; // expected-error{{address of overloaded function 'templatedBar' does not match required type 'int (int)'}} expected-note@214{{candidate function made ineligible by enable_if}}
int (*p2)(int) = &templatedBar<int>; // expected-error{{address of overloaded function 'templatedBar' does not match required type 'int (int)'}} expected-note@214{{candidate function made ineligible by enable_if}}
int (*a)(int);
a = templatedBar<int>; // expected-error{{assigning to 'int (*)(int)' from incompatible type '<overloaded function type>'}} expected-note@214{{candidate function made ineligible by enable_if}}
a = &templatedBar<int>; // expected-error{{assigning to 'int (*)(int)' from incompatible type '<overloaded function type>'}} expected-note@214{{candidate function made ineligible by enable_if}}
}
template <typename T>
T templatedConflict(T m) __attribute__((enable_if(false, ""))) { return T(); }
template <typename T>
T templatedConflict(T m) __attribute__((enable_if(true, ""))) { return T(); }
template <typename T>
T templatedConflict(T m) __attribute__((enable_if(1, ""))) { return T(); }
void test6() {
int (*p)(int) = templatedConflict<int>; // expected-error{{address of overloaded function 'templatedConflict' is ambiguous}} expected-note@224{{candidate function made ineligible by enable_if}} expected-note@226{{candidate function}} expected-note@228{{candidate function}}
int (*p0)(int) = &templatedConflict<int>; // expected-error{{address of overloaded function 'templatedConflict' is ambiguous}} expected-note@224{{candidate function made ineligible by enable_if}} expected-note@226{{candidate function}} expected-note@228{{candidate function}}
int (*a)(int);
a = templatedConflict<int>; // expected-error{{assigning to 'int (*)(int)' from incompatible type '<overloaded function type>'}} expected-note@226{{candidate function}} expected-note@228{{candidate function}}
a = &templatedConflict<int>; // expected-error{{assigning to 'int (*)(int)' from incompatible type '<overloaded function type>'}} expected-note@226{{candidate function}} expected-note@228{{candidate function}}
}
}