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/*
TEST_OUTPUT:
---
pure nothrow @safe Object(bool b)
pure nothrow @safe int*(bool b)
pure nothrow @safe int[](bool b)
---
RUN_OUTPUT:
---
Success
---
*/
extern (C) int printf(const(char*) fmt, ...);
alias typeof(null) null_t;
/**********************************************/
void test1()
{
null_t null1;
typeof(null) null2;
static assert(is(typeof(null1) == typeof(null)));
static assert(is(typeof(null2) == typeof(null)));
static assert(is(typeof(null1) == null_t));
static assert(is(typeof(null2) == null_t));
}
/**********************************************/
interface I{}
class C{}
int f(null_t) { return 1; }
int f(int[]) { return 2; }
int f(C) { return 3; }
void test2()
{
static assert(is(null_t : C));
static assert(is(null_t : I));
static assert(is(null_t : int[]));
static assert(is(null_t : void*));
static assert(is(null_t : int**));
static assert(!is(null_t == C));
static assert(!is(null_t == I));
static assert(!is(null_t == int[]));
static assert(!is(null_t == void*));
static assert(!is(null_t == int**));
static assert(is(null_t == null_t));
assert(f(null) == 1);
}
/**********************************************/
// https://issues.dlang.org/show_bug.cgi?id=5899
auto f5899(bool b)
{
if (b)
return new Object;
else
return null;
}
static assert(is(typeof(f5899) R == return) && is(R == Object));
pragma(msg, typeof(f5899));
auto g5899(bool b)
{
if (b)
return new int;
else
return null;
}
static assert(is(typeof(g5899) R == return) && is(R == int*));
pragma(msg, typeof(g5899));
auto h5899(bool b)
{
if (b)
return [1];
else
return null;
}
static assert(is(typeof(h5899) R == return) && is(R == int[]));
pragma(msg, typeof(h5899));
/**********************************************/
// https://issues.dlang.org/show_bug.cgi?id=7278
struct Foo7278(string s)
{
string var;
void func()
{
string local = var;
}
}
void test7278()
{
Foo7278!null a;
Foo7278!null b;
}
/**********************************************/
// https://issues.dlang.org/show_bug.cgi?id=8221
class A8221
{
A8221 foo() { return this; }
}
class B8221: A8221
{
override typeof(null) foo() { return null; } // error
}
void test8221()
{
auto a = new A8221();
assert(a.foo() is a);
auto b = new B8221();
assert(b.foo() is null);
a = b;
assert(a.foo() is null);
}
/***************************************************/
// https://issues.dlang.org/show_bug.cgi?id=8589
void test8589()
{
static typeof(null) retnull() { return null; }
void test(bool result, T)()
{
void f(T function() dg) { assert(!dg()); }
static assert((is(typeof(null) function() : T function())) == result);
static assert(is(typeof( f(&retnull) )) == result);
static assert(is(typeof( f(()=>null) )) == result);
static if (result)
{
f(&retnull);
f(()=>null);
}
}
test!(true, int*)();
test!(true, Object)();
test!(false, int[int])();
test!(false, int[])();
test!(false, void delegate())();
}
/**********************************************/
// https://issues.dlang.org/show_bug.cgi?id=9385
void test9385()
{
assert((null ? true : false) == false);
if (null) assert(0);
assert(!null);
}
/**********************************************/
// https://issues.dlang.org/show_bug.cgi?id=12203
void test12203()
{
typeof(null) v;
void foo(float) {}
void delegate(float) dg = &foo;
assert(dg !is null);
dg = v; // Error: e2ir: cannot cast v of type typeof(null) to type void delegate(float)
assert(dg is null);
}
/**********************************************/
int main()
{
test1();
test2();
test7278();
test8221();
test8589();
test9385();
test12203();
printf("Success\n");
return 0;
}
|
