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template <typename T>
struct canref {
struct yes { uint8_t bytes[1]; };
struct no { uint8_t bytes[2]; };
template <typename U> static yes test(U*p);
template <typename U> static no test(...);
static const bool value = sizeof(test<T>(NULL)) == sizeof(yes);
};
template <typename T, int N, bool CanRef=canref<T>::value>
class array;
// class for all types
template <typename T, int N>
class array <T,N,true>
{
struct Bytes
{
uint8_t bytes[sizeof(T)];
};
struct TStruct
{
T t;
TStruct(T t):t(t){}
};
Bytes elements[N];
int count;
void copy_ctor (int index, const T& t)
{
new (&((*this)[index])) T(t);
}
void copy (int index, const T& t)
{
(*this)[index] = t;
}
void dtor (int index)
{
(*this)[index].~T();
}
public:
array () : count(0) {}
~array ()
{
resize(0);
}
T& operator [] (int index)
{
assert (index>=0 && index<count);
return ((TStruct*)(&elements[index]))->t;
}
const T& operator [] (int index) const
{
assert (index>=0 && index<count);
return ((TStruct*)(&elements[index]))->t;
}
template <int M>
array (const array<T,M> &a)
{
assert(a.count<=N);
count = a.count;
for (int i=0; i<count; ++i)
copyctor(i, a[i]);
}
template <int M>
array& operator = (const array<T,M> &a)
{
if (this != &a)
{
if (count>a.count)
{
for (int i=0; i<a.count; ++i) copy(i, a[i]);
for (int i=a.count; i<count; ++i) dtor(i);
count = a.count;
} else
{
assert(a.count<=N);
int ocount = count;
count = a.count;
for (int i=0; i<ocount; ++i) copy(i, a[i]);
for (int i=ocount; i<count; ++i) copy_ctor(i, a[i]);
}
}
}
int size()
{
return count;
}
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