Question

Lets say I have : (this class Is OK)

class CCheckSystemEndianess
{
private:
    int i;
    char checker[sizeof(int)];
public:
    CCheckSystemEndianess() : i(1) { }
    bool isLittleEndian()   { return (checker[0] != 0); }
};

But this one acts strange

template <bool checker>
class CEndian
{
private:
    template <typename T>
    T swapEndianess (const T& value)
    {
        if (CCheckSystemEndianess().isLittleEndian() == checker)
        {
            return value;
        }
.................

The main problem is that if I create CEndian different ways I get different results with CCheckSystemEndianess().isLittleEndian()

For ex.

CEndian<false> *p_endian = new CEndian<false>();

then this line becomes

CcheckSystemEndianess().isLittleEndian() = false 

But if I create CEndian like this

std::unique_ptr<CEndian<false> > p_endian (new Cendian<false>());

then this line becomes
CcheckSystemEndianess().isLittleEndian() = true.

And yes If I create CCheckSystemEndianes inside CEndian class everything goes OK

template <typename T>
T swapEndianess (const T& value)
{
   std::unique_ptr<CCheckSystemEndianess> endianCheck(newCCheckSystemEndianess);

checkSystemEndianess().isLittleEndian() both ways with smart and with raw pointer gets true….

I am confused there a bit ..

Edit:
Thanks to Cubbi for pointing out that CCheckSystemEndianess has to be union not class.

Answer 1

In CCheckSystemEndianess, i, and checker are two unrelated objects. The value 1 written to i by the constructor has no bearing on the contents of checker which remain uninitialized.

Perhaps your intent was to make a union?