PIVector2D removeColumn memmove optimization

libs/main/containers/pivector2d.h

@@ -1219,14 +1219,21 @@ public:
 	//! \sa removeRow(), PIVector::remove()
 	inline PIVector2D<T> & removeColumn(size_t col) {
 		if (col >= cols_ || rows_ == 0) return *this;
-		PIVector2D<T> result(rows_, cols_ - 1);
 		for (size_t r = 0; r < rows_; ++r) {
-			for (size_t c = 0, nc = 0; c < cols_; ++c) {
-				if (c == col) continue;
-				result.element(r, nc++) = element(r, c);
+			T * dst = mat.data(r * (cols_ - 1));
+			T * src = mat.data(r * cols_);
+			if (col > 0) {
+				memmove(dst, src, col * sizeof(T));
+				dst += col;
+				src += col;
+			}
+			size_t remaining = (cols_ - 1) - col;
+			if (remaining > 0) {
+				memmove(dst, src + 1, remaining * sizeof(T));
 			}
 		}
-		swap(result);
+		cols_--;
+		mat.resize(rows_ * cols_);
 		return *this;
 	}