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// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify -std=c++20 %s
// RUN: %clang_cc1 -verify=ref -std=c++20 %s
constexpr int a = 12;
constexpr int f = [c = a]() { return c; }();
static_assert(f == a);
constexpr int inc() {
int a = 10;
auto f = [&a]() {
++a;
};
f();f();
return a;
}
static_assert(inc() == 12);
constexpr int add(int a, int b) {
auto doIt = [a, b](int c) {
return a + b + c;
};
return doIt(2);
}
static_assert(add(4, 5) == 11);
constexpr int add2(int a, int b) {
auto doIt = [a, b](int c) {
auto bar = [a]() { return a; };
auto bar2 = [b]() { return b; };
return bar() + bar2() + c;
};
return doIt(2);
}
static_assert(add2(4, 5) == 11);
constexpr int div(int a, int b) {
auto f = [=]() {
return a / b; // expected-note {{division by zero}} \
// ref-note {{division by zero}}
};
return f(); // expected-note {{in call to '&f->operator()()'}} \
// ref-note {{in call to 'f.operator()()'}}
}
static_assert(div(8, 2) == 4);
static_assert(div(8, 0) == 4); // expected-error {{not an integral constant expression}} \
// expected-note {{in call to 'div(8, 0)'}} \
// ref-error {{not an integral constant expression}} \
// ref-note {{in call to 'div(8, 0)'}}
struct F {
float f;
};
constexpr float captureStruct() {
F someF = {1.0};
auto p = [someF]() {
return someF.f;
};
return p();
}
static_assert(captureStruct() == 1.0);
int constexpr FunCase() {
return [x = 10] {
decltype(x) y; // type int b/c not odr use
// refers to original init-capture
auto &z = x; // type const int & b/c odr use
// refers to lambdas copy of x
y = 10; // Ok
//z = 10; // Ill-formed
return y;
}();
}
constexpr int WC = FunCase();
namespace LambdaParams {
template<typename T>
constexpr void callThis(T t) {
return t();
}
constexpr int foo() {
int a = 0;
auto f = [&a]() { ++a; };
callThis(f);
return a;
}
/// FIXME: This should work in the new interpreter.
static_assert(foo() == 1); // expected-error {{not an integral constant expression}}
}
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