X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flinal%2Fvector.h;h=31597d4282410e2606590eaea2faa6d3c22c2cd9;hb=0a8781509bafe347b9c32f1106891eac18354965;hp=9ef46fde412f22804535065d6dd59c10b11963e2;hpb=643aa7b2317f88463f66da11e595ebe0f6c9621d;p=libs%2Fmath.git

diff --git a/source/linal/vector.h b/source/linal/vector.h
index 9ef46fd..31597d4 100644
--- a/source/linal/vector.h
+++ b/source/linal/vector.h
@@ -3,6 +3,7 @@
 
 #include <algorithm>
 #include <cmath>
+#include <ostream>
 
 namespace Msp {
 namespace LinAl {
@@ -74,17 +75,30 @@ template<typename T, unsigned N>
 class Vector: public VectorComponents<T, N>
 {
 public:
+	typedef T ElementType;
+
 	Vector();
 	Vector(const T *);
+
+	/** Constructs a vector from an array of interleaved values.  Intended for
+	use by Matrix row accessor. */
+	Vector(const T *, unsigned);
+
+#if __cplusplus >= 201103L
+	template<typename... Args>
+	Vector(T, Args...);
+#else
 	Vector(T, T);
 	Vector(T, T, T);
 	Vector(T, T, T, T);
+#endif
 	template<typename U>
 	Vector(const Vector<U, N> &);
-	template<typename U>
-	Vector(const Vector<U, N-1> &, U);
-	template<typename U>
-	explicit Vector(const Vector<U, N+1> &);
+
+	unsigned size() const { return N; }
+
+	template<unsigned M>
+	Vector<T, M> slice(unsigned) const;
 
 	Vector &operator*=(T);
 	Vector &operator/=(T);
@@ -110,6 +124,25 @@ inline Vector<T, N>::Vector(const T *d)
 		(*this)[i] = d[i];
 }
 
+template<typename T, unsigned N>
+inline Vector<T, N>::Vector(const T *d, unsigned stride)
+{
+	for(unsigned i=0; i<N; ++i)
+		(*this)[i] = d[i*stride];
+}
+
+#if __cplusplus >= 201103L
+template<typename T, unsigned N>
+template<typename... Args>
+inline Vector<T, N>::Vector(T x_, Args... v)
+{
+	static_assert(1+sizeof...(v)==N, "Incorrect number of arguments in Vector constructor");
+	(*this)[0] = x_;
+	unsigned i = 1;
+	for(auto c: std::initializer_list<T> { static_cast<T>(v)... })
+		(*this)[i++] = c;
+}
+#else
 /* The compiler won't instantiate these unless they are used.  Trying to use
 them on the wrong class results in an error. */
 template<typename T, unsigned N>
@@ -135,6 +168,7 @@ inline Vector<T, N>::Vector(T x_, T y_, T z_, T w_)
 	this->VectorComponents<T, 4>::z = z_;
 	this->VectorComponents<T, 4>::w = w_;
 }
+#endif
 
 template<typename T, unsigned N>
 template<typename U>
@@ -145,20 +179,44 @@ inline Vector<T, N>::Vector(const Vector<U, N> &v)
 }
 
 template<typename T, unsigned N>
-template<typename U>
-inline Vector<T, N>::Vector(const Vector<U, N-1> &v, U s)
+inline Vector<T, N+1> compose(const Vector<T, N> &v, T s)
 {
-	for(unsigned i=0; i<N-1; ++i)
-		(*this)[i] = v[i];
-	(*this)[N-1] = s;
+	Vector<T, N+1> r;
+	for(unsigned i=0; i<N; ++i)
+		r[i] = v[i];
+	r[N] = s;
+	return r;
 }
 
 template<typename T, unsigned N>
-template<typename U>
-inline Vector<T, N>::Vector(const Vector<U, N+1> &v)
+inline Vector<T, N+1> compose(T s, const Vector<T, N> &v)
 {
+	Vector<T, N+1> r;
+	r[0] = s;
 	for(unsigned i=0; i<N; ++i)
-		(*this)[i] = v[i];
+		r[i+1] = v[i];
+	return r;
+}
+
+template<typename T, unsigned N, unsigned M>
+inline Vector<T, N+M> compose(const Vector<T, N> &v1, const Vector<T, M> &v2)
+{
+	Vector<T, N+M> r;
+	for(unsigned i=0; i<N; ++i)
+		r[i] = v1[i];
+	for(unsigned i=0; i<M; ++i)
+		r[N+i] = v2[i];
+	return r;
+}
+
+template<typename T, unsigned N>
+template<unsigned M>
+inline Vector<T, M> Vector<T, N>::slice(unsigned j) const
+{
+	Vector<T, M> r;
+	for(unsigned i=0; i<M; ++i)
+		r[i] = (*this)[j+i];
+	return r;
 }
 
 template<typename T, unsigned N>
@@ -286,6 +344,20 @@ inline Vector<T, 3> cross(const Vector<T, 3> &v1, const Vector<T, 3> &v2)
 	return Vector<T, 3>(v1.y*v2.z-v1.z*v2.y, v1.z*v2.x-v1.x*v2.z, v1.x*v2.y-v1.y*v2.x);
 }
 
+template<typename T, unsigned N>
+inline std::ostream &operator<<(std::ostream &s, const Vector<T, N> &v)
+{
+	s << "Vector" << N << '(';
+	for(unsigned i=0; i<N; ++i)
+	{
+		if(i)
+			s << ", ";
+		s << v[i];
+	}
+	s << ')';
+	return s;
+}
+
 } // namespace LinAl
 } // namespace Msp