assertEmpty

Assert that a range is empty.

void assertEmpty(A array, string message, string file, size_t line)
void assertEmpty(R range, string message, string file, size_t line)
void
assertEmpty
(
R
)
(
R range
,
string message = "Failed asserting empty range"
,
string file = __FILE__
,
size_t line = __LINE__
)
if (
(
is(R == class) ||
is(R == struct)
) &&
isInputRange!(R)
)

Parameters

range R: The range to interogate.
message string: The error message to display.
file string: The file name where the error occurred. The value is added automatically at the call site.
line size_t: The line where the error occurred. The value is added automatically at the call site.

Throws

DUnitAssertError if the assertation fails.

Examples

class A
{
	void popFront() {};
	@property bool empty() { return true; };
	@property int front() { return 0; };
}

struct B
{
	void popFront() {};
	enum bool empty = false;
	@property int front() { return 1; };
}

static assert(isInputRange!(A));
static assert(isInputRange!(B));

auto emptyRange = new A();
emptyRange.assertEmpty();

B infiniteRange = B.init;
infiniteRange.takeNone.assertEmpty();

// Assert a DUnitAssertError is thrown if assertEmpty fails.
infiniteRange.assertEmpty().assertThrow!(DUnitAssertError)("Failed asserting empty range");
infiniteRange.take(10).assertEmpty().assertThrow!(DUnitAssertError)("Failed asserting empty range");

assertEmpty

Parameters

Throws

Examples

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