Make all array constructors explicit (#99)

* Make all array constructors explicit

to avoid accidental implicit casts like e.g.
Vector3f v = 0;
assigning nullpointer content.

matrix/AxisAngle.hpp

@@ -37,7 +37,7 @@ public:
      *
      * @param data_ array
      */
-    AxisAngle(const Type data_[3]) :
+    explicit AxisAngle(const Type data_[3]) :
         Vector<Type, 3>(data_)
     {
     }

matrix/Dcm.hpp

@@ -56,7 +56,16 @@ public:
      *
      * @param _data pointer to array
      */
-    Dcm(const Type *data_) : SquareMatrix<Type, 3>(data_)
+    explicit Dcm(const Type data_[3][3]) : SquareMatrix<Type, 3>(data_)
+    {
+    }
+
+    /**
+     * Constructor from array
+     *
+     * @param _data pointer to array
+     */
+    explicit Dcm(const Type data_[3*3]) : SquareMatrix<Type, 3>(data_)
     {
     }
 

matrix/Matrix.hpp

@@ -41,12 +41,12 @@ public:
     // Constructors
     Matrix() = default;
 
-    Matrix(const Type data_[M*N])
+    explicit Matrix(const Type data_[M*N])
     {
         memcpy(_data, data_, sizeof(_data));
     }
 
-    Matrix(const Type data_[M][N])
+    explicit Matrix(const Type data_[M][N])
     {
         memcpy(_data, data_, sizeof(_data));
     }

matrix/Quaternion.hpp

@@ -61,7 +61,7 @@ public:
      *
      * @param data_ array
      */
-    Quaternion(const Type data_[4]) :
+    explicit Quaternion(const Type data_[4]) :
         Vector<Type, 4>(data_)
     {
     }

matrix/SquareMatrix.hpp

@@ -28,7 +28,12 @@ class SquareMatrix : public Matrix<Type, M, M>
 public:
     SquareMatrix() = default;
 
-    SquareMatrix(const Type data_[M][M]) :
+    explicit SquareMatrix(const Type data_[M][M]) :
+        Matrix<Type, M, M>(data_)
+    {
+    }
+
+    explicit SquareMatrix(const Type data_[M*M]) :
         Matrix<Type, M, M>(data_)
     {
     }

matrix/Vector.hpp

@@ -29,7 +29,7 @@ public:
     {
     }
 
-    Vector(const Type data_[M]) :
+    explicit Vector(const Type data_[M]) :
         MatrixM1(data_)
     {
     }

matrix/Vector2.hpp

@@ -31,7 +31,7 @@ public:
     {
     }
 
-    Vector2(const Type data_[2]) :
+    explicit Vector2(const Type data_[2]) :
         Vector<Type, 2>(data_)
     {
     }

matrix/Vector3.hpp

@@ -39,7 +39,7 @@ public:
     {
     }
 
-    Vector3(const Type data_[3]) :
+    explicit Vector3(const Type data_[3]) :
         Vector<Type, 3>(data_)
     {
     }