warning-free.cpp

//Who can get any microsoft vc++ compiler to emit any warning for any of the horrific code below? 
//apparently not me!
//
//Bye, Lucas (@lucasmeijer)

bool boolA, boolB, boolC;

enum MyEnum { kOne, kTwo };
MyEnum myenum;

enum MyOtherEnum { kOtherOne, kOtherTwo };
MyOtherEnum myotherenum;

//a constant float that isn't used anywhere. please warn me!  (-Wunused-const-variable)
const float unused_const = 3;

//encourage me to use { {1,2}, {3,4} } to make it harder to screw up.  -Wmissing-braces 
int my_array[2][2] = { 1,2,3,4 };

struct StructWithTWoMembers
{
	int a,b;
};

struct MyBase
{
	virtual void func() {}
};

struct MyChild : public MyBase
{
	//overriding a base function without specifying 'override', please warn me!  (-Winconsistent-missing-override)
	virtual void func() {}

private:
	//completely unused member, please let me know! (-Wunused-private-field)
	int* unused_private_member;
};

int main()
{
	MyChild m;
	m.func();

	switch (myenum)
	{
		case kOne: return 1;
			//kTwo is missing here. please warn me! (-Wswitch)
	}

	//comparing two enums that have different types. warn me plz!  (-Wenum-compare)
	if (myenum == myotherenum)
		return 1;

	//easy to misinterpet / misread / miswrite, please tell me to add braces around boolA && boolB.  (-Wlogical-op-parentheses)
	if (boolA && boolB || boolC)
		return 1;

	//dangling-else problem:  to which if statement does the else statement belong. force the dev to be explicit! (-Wdangling-else)
	if (boolA)
		if (boolB)
			return 3;
		else
			return 4;

	//this expression is always false, an unsigned int can never be -3.  also 9 can never be -3 either.
	unsigned int unsigned_int = 9;
	if (unsigned_int == -3)
		return 3;

	//a statement that does nothing.  (-Wunused-value)
	(unsigned_int < 102);

	//assigning to itself.  -Wself-assign
	boolA = boolA;

	//taking a non const char* to a string literal   (-Wwritable-strings)
	char* c = "myliteral";
	(void)c;

	//only initialize one member of a struct that has two.  (-Wmissing-field-intializers)
	StructWithTwoMembers swtm = { 2 };

	return 0;
}