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struct Zero
{
int x;
}
void testZero()
{
auto zeroInit = __traits(initSymbol, Zero);
static assert(is(typeof(zeroInit) == const(void[])));
assert(zeroInit.ptr is null);
assert(zeroInit.length == Zero.sizeof);
}
struct NonZero
{
long x = 1;
}
void testNonZero()
{
auto nonZeroInit = __traits(initSymbol, NonZero);
static assert(is(typeof(nonZeroInit) == const(void[])));
assert(nonZeroInit.ptr);
assert(nonZeroInit.length == NonZero.sizeof);
assert(cast(const(long[])) nonZeroInit == [1L]);
}
class C
{
short x = 123;
}
void testClass()
{
auto cInit = __traits(initSymbol, C);
static assert(is(typeof(cInit) == const(void[])));
assert(cInit.ptr);
assert(cInit.length == __traits(classInstanceSize, C));
scope c = new C;
assert((cast(void*) c)[0 .. cInit.length] == cInit);
}
struct AlignedStruct
{
short s = 5;
// 2 byte padding
align(4) char c = 'c';
// 3 byte padding
int i = 4;
// reduced alignment
align(1) long l = 0xDEADBEEF;
}
void testAlignedStruct()
{
auto init = __traits(initSymbol, AlignedStruct);
assert(init.ptr);
assert(init.length == AlignedStruct.sizeof);
version (GNU)
AlignedStruct exp = AlignedStruct();
else
AlignedStruct exp;
assert(init == (cast(void*) &exp)[0 .. AlignedStruct.sizeof]);
}
class AlignedClass : C
{
short s = 5;
// 2 byte padding
align(4) char c = 'c';
// 3 byte padding
int i = 4;
// reduced alignment
align(1) long l = 0xDEADBEEF;
}
void testAlignedClass()
{
auto init = __traits(initSymbol, AlignedClass);
assert(init.ptr);
assert(init.length == __traits(classInstanceSize, AlignedClass));
scope ac = new AlignedClass();
assert(init == (cast(void*) ac)[0 .. init.length]);
}
extern (C++) class ExternCppClass
{
int i = 4;
}
void testExternCppClass()
{
auto init = __traits(initSymbol, ExternCppClass);
assert(init.ptr);
assert(init.length == __traits(classInstanceSize, ExternCppClass));
scope ac = new ExternCppClass();
assert(init == (cast(void*) ac)[0 .. init.length]);
}
void main()
{
testZero();
testNonZero();
testClass();
testAlignedStruct();
testAlignedClass();
testExternCppClass();
}
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