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// RUN: %clang_cc1 -std=c++23 -verify %s
void test_consteval() {
if consteval ({(void)1;}); // expected-error {{expected { after consteval}}
if consteval (void) 0; // expected-error {{expected { after consteval}}
if consteval {
(void)0;
} else (void)0; // expected-error {{expected { after else}}
static_assert([] {
if consteval {
return 0;
}
return 1;
}() == 0);
static_assert([] {
if consteval {
return 0;
} else {
return 1;
}
}() == 0);
static_assert([] {
if !consteval {
return 0;
} else {
return 1;
}
}() == 1);
static_assert([] {
if not consteval {
return 0;
}
return 1;
}() == 1);
if consteval [[likely]] { // expected-warning {{attribute 'likely' has no effect when annotating an 'if consteval' statement}}\
// expected-note 2{{annotating the 'if consteval' statement here}}
}
else [[unlikely]] { // expected-warning {{attribute 'unlikely' has no effect when annotating an 'if consteval' statement}}
}
}
void test_consteval_jumps() {
if consteval { // expected-note 4{{jump enters controlled statement of consteval if}}
goto a;
goto b; // expected-error {{cannot jump from this goto statement to its label}}
a:;
} else {
goto b;
goto a; // expected-error {{cannot jump from this goto statement to its label}}
b:;
}
goto a; // expected-error {{cannot jump from this goto statement to its label}}
goto b; // expected-error {{cannot jump from this goto statement to its label}}
}
void test_consteval_switch() {
int x = 42;
switch (x) {
if consteval { // expected-note 2{{jump enters controlled statement of consteval if}}
case 1:; // expected-error {{cannot jump from switch statement to this case label}}
default:; // expected-error {{cannot jump from switch statement to this case label}}
} else {
}
}
switch (x) {
if consteval { // expected-note 2{{jump enters controlled statement of consteval if}}
} else {
case 2:; // expected-error {{cannot jump from switch statement to this case label}}
default:; // expected-error {{cannot jump from switch statement to this case label}}
}
}
}
consteval int f(int i) { return i; }
constexpr int g(int i) {
if consteval {
return f(i);
} else {
return 42;
}
}
static_assert(g(10) == 10);
constexpr int h(int i) { // expected-note {{declared here}}
if !consteval {
return f(i); // expected-error {{call to consteval function 'f' is not a constant expression}}\
// expected-note {{cannot be used in a constant expression}}
}
return 0;
}
consteval void warn_in_consteval() {
if consteval { // expected-warning {{consteval if is always true in an immediate context}}
if consteval {} // expected-warning {{consteval if is always true in an immediate context}}
}
}
constexpr void warn_in_consteval2() {
if consteval {
if consteval {} // expected-warning {{consteval if is always true in an immediate context}}
}
}
auto y = []() consteval {
if consteval { // expected-warning {{consteval if is always true in an immediate context}}
if consteval {} // expected-warning {{consteval if is always true in an immediate context}}
}
};
namespace test_transform {
int f(auto n) {
if consteval {
n.foo; //expected-error {{no member named}}
}
else {
}
if !consteval {
n.foo; //expected-error {{no member named}}
}
else {
}
return 0;
}
constexpr int g(auto n) {
if consteval {
}
else {
n.foo; //expected-error {{no member named}}
}
if !consteval {
}
else {
n.foo; //expected-error {{no member named}}
}
return 0;
}
struct S {};
void test() {
f(S{}); //expected-note {{in instantiation}}
g(S{}); //expected-note {{in instantiation}}
}
}
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