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254  template<typename T, unsigned int elemCount>
struct vecN
{
public:
vecN() {}
template<class... Args>
vecN(Args... args)
{
Set(args...);
}
template<class... Args>
void Set(Args... args)
{
const int n = sizeof...(Args);
static_assert(n == elemCount, "Invalid number of arguments for vector type");
data = { { args... } };
}
void Multiply(T _mulVal)
{
std::for_each(data.begin(), data.end(), [&_mulVal](T& elem) { elem*= _mulVal; });
}
void Multiply(vecN<T,elemCount> _mulVal)
{
int counter = 0;
std::for_each(data.begin(), data.end(), [&counter, &_mulVal](T& elem) { elem *= _mulVal.data[counter++]; });
}
void Add(T _addVal)
{
std::for_each(data.begin(), data.end(), [&_addVal](T& elem) { elem += _addVal; });
}
void Add(vecN<T, elemCount> _addVal)
{
int counter = 0;
std::for_each(data.begin(), data.end(), [&counter, &_addVal](T& elem) { elem += _addVal.data[counter++]; });
}
float Length()
{
std::array<T, elemCount> dataSqr = data;
std::for_each(dataSqr.begin(), dataSqr.end(), [](T& elem) { elem = elem*elem; });
T sum = std::accumulate(dataSqr.begin(), dataSqr.end(), (T)0);
return sqrt(sum);
}
void Normalise()
{
T len = 1.0/Length();
std::for_each(data.begin(), data.end(), [&len](T& elem) { elem *= len; });
}
vecN<T, elemCount  1> PopElem()
{
vecN<T, elemCount  1> output;
std::copy_n(data.begin(), elemCount1, output.data.begin());
return output;
}
vecN<T, elemCount + 1> PushElem(T _value = 0.0)
{
vecN<T, elemCount + 1> output;
std::copy_n(data.begin(), elemCount, output.data.begin());
output.data[elemCount] = _value;
return output;
}
template<int _size>
constexpr vecN<T, _size> GetResizedVector()
{
vecN<T, _size> output;
std::copy_n(data.begin(), std::min((unsigned int)(_size), elemCount), output.data.begin());
return output;
}
constexpr T& GetElement(int _index)
{
return data[_index];
}
template<int _index>
constexpr T& GetElement()
{
return data[_index];
}
template<class... Indexs>
constexpr vecN<T, sizeof...(Indexs)> GetOrderedArrayOfIndices(Indexs... indxs)
{
vecN<T, sizeof...(Indexs)> output;
output.data = { { data[indxs]... } };
return output;
}
constexpr T& x()
{
static_assert(1 <= elemCount, "Invalid number of arguments for vector type");
return data[0];
}
constexpr T& y()
{
static_assert(2 <= elemCount, "Invalid number of arguments for vector type");
return data[1];
}
constexpr T& z()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
return data[2];
}
constexpr T& w()
{
static_assert(4 <= elemCount, "Invalid number of arguments for vector type");
return data[3];
}
constexpr std::array<T, 3> xxx()
{
static_assert(1 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[0], data[0], data[0] };
return xyz;
}
constexpr std::array<T, 3> yyy()
{
static_assert(2 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[1], data[1], data[1] };
return xyz;
}
constexpr std::array<T, 3> zzz()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[2], data[2], data[2] };
return xyz;
}
constexpr std::array<T, 3> xyz()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[0], data[1], data[2] };
return xyz;
}
constexpr std::array<T, 3> xzy()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[0], data[2], data[1] };
return xyz;
}
constexpr std::array<T, 3> yzx()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[1], data[2], data[0] };
return xyz;
}
constexpr std::array<T, 3> yxz()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[1], data[0], data[2] };
return xyz;
}
constexpr std::array<T, 3> zyx()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[2], data[1], data[0] };
return xyz;
}
constexpr std::array<T, 3> zxy()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 3> xyz = { data[2], data[0], data[1] };
return xyz;
}
constexpr std::array<T, 2> xx()
{
static_assert(1 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[0], data[0] };
return xyz;
}
constexpr std::array<T, 2> xy()
{
static_assert(2 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[0], data[1] };
return xyz;
}
constexpr std::array<T, 2> xz()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[0], data[2] };
return xyz;
}
constexpr std::array<T, 2> yx()
{
static_assert(2 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[1], data[0] };
return xyz;
}
constexpr std::array<T, 2> yy()
{
static_assert(2 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[1], data[1] };
return xyz;
}
constexpr std::array<T, 2> yz()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[1], data[2] };
return xyz;
}
constexpr std::array<T, 2> zx()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[2], data[0] };
return xyz;
}
constexpr std::array<T, 2> zy()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[2], data[1] };
return xyz;
}
constexpr std::array<T, 2> zz()
{
static_assert(3 <= elemCount, "Invalid number of arguments for vector type");
std::array<T, 2> xyz = { data[2], data[1] };
return xyz;
}
std::array<T, elemCount> data;
};
typedef vecN<float, 4> float4;
typedef vecN<float, 3> float3;
typedef vecN<float, 2> float2;
typedef vecN<float, 1> float1;
