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diff --git a/src/armadillo/include/armadillo_bits/glue_join_meat.hpp b/src/armadillo/include/armadillo_bits/glue_join_meat.hpp
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+++ b/src/armadillo/include/armadillo_bits/glue_join_meat.hpp
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup glue_join
+//! @{
+
+
+
+template<typename T1, typename T2>
+inline
+void
+glue_join_cols::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& A, const Proxy<T2>& B)
+ {
+ arma_extra_debug_sigprint();
+
+ const uword A_n_rows = A.get_n_rows();
+ const uword A_n_cols = A.get_n_cols();
+
+ const uword B_n_rows = B.get_n_rows();
+ const uword B_n_cols = B.get_n_cols();
+
+ arma_debug_check
+ (
+ ( (A_n_cols != B_n_cols) && ( (A_n_rows > 0) || (A_n_cols > 0) ) && ( (B_n_rows > 0) || (B_n_cols > 0) ) ),
+ "join_cols() / join_vert(): number of columns must be the same"
+ );
+
+ out.set_size( A_n_rows + B_n_rows, (std::max)(A_n_cols, B_n_cols) );
+
+ if( out.n_elem > 0 )
+ {
+ if(A.get_n_elem() > 0)
+ {
+ out.submat(0, 0, A_n_rows-1, out.n_cols-1) = A.Q;
+ }
+
+ if(B.get_n_elem() > 0)
+ {
+ out.submat(A_n_rows, 0, out.n_rows-1, out.n_cols-1) = B.Q;
+ }
+ }
+ }
+
+
+
+
+template<typename T1, typename T2>
+inline
+void
+glue_join_cols::apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_join_cols>& X)
+ {
+ arma_extra_debug_sigprint();
+
+ typedef typename T1::elem_type eT;
+
+ const Proxy<T1> A(X.A);
+ const Proxy<T2> B(X.B);
+
+ if( (A.is_alias(out) == false) && (B.is_alias(out) == false) )
+ {
+ glue_join_cols::apply_noalias(out, A, B);
+ }
+ else
+ {
+ Mat<eT> tmp;
+
+ glue_join_cols::apply_noalias(tmp, A, B);
+
+ out.steal_mem(tmp);
+ }
+ }
+
+
+
+template<typename eT, typename T1, typename T2, typename T3>
+inline
+void
+glue_join_cols::apply(Mat<eT>& out, const Base<eT,T1>& A_expr, const Base<eT,T2>& B_expr, const Base<eT,T3>& C_expr)
+ {
+ arma_extra_debug_sigprint();
+
+ const quasi_unwrap<T1> UA(A_expr.get_ref());
+ const quasi_unwrap<T2> UB(B_expr.get_ref());
+ const quasi_unwrap<T3> UC(C_expr.get_ref());
+
+ const Mat<eT>& A = UA.M;
+ const Mat<eT>& B = UB.M;
+ const Mat<eT>& C = UC.M;
+
+ const uword out_n_rows = A.n_rows + B.n_rows + C.n_rows;
+ const uword out_n_cols = (std::max)((std::max)(A.n_cols, B.n_cols), C.n_cols);
+
+ arma_debug_check( ((A.n_cols != out_n_cols) && ((A.n_rows > 0) || (A.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+ arma_debug_check( ((B.n_cols != out_n_cols) && ((B.n_rows > 0) || (B.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+ arma_debug_check( ((C.n_cols != out_n_cols) && ((C.n_rows > 0) || (C.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+
+ out.set_size(out_n_rows, out_n_cols);
+
+ if(out.n_elem == 0) { return; }
+
+ uword row_start = 0;
+ uword row_end_p1 = 0;
+
+ if(A.n_elem > 0) { row_end_p1 += A.n_rows; out.rows(row_start, row_end_p1 - 1) = A; }
+
+ row_start = row_end_p1;
+
+ if(B.n_elem > 0) { row_end_p1 += B.n_rows; out.rows(row_start, row_end_p1 - 1) = B; }
+
+ row_start = row_end_p1;
+
+ if(C.n_elem > 0) { row_end_p1 += C.n_rows; out.rows(row_start, row_end_p1 - 1) = C; }
+ }
+
+
+
+template<typename eT, typename T1, typename T2, typename T3, typename T4>
+inline
+void
+glue_join_cols::apply(Mat<eT>& out, const Base<eT,T1>& A_expr, const Base<eT,T2>& B_expr, const Base<eT,T3>& C_expr, const Base<eT,T4>& D_expr)
+ {
+ arma_extra_debug_sigprint();
+
+ const quasi_unwrap<T1> UA(A_expr.get_ref());
+ const quasi_unwrap<T2> UB(B_expr.get_ref());
+ const quasi_unwrap<T3> UC(C_expr.get_ref());
+ const quasi_unwrap<T4> UD(D_expr.get_ref());
+
+ const Mat<eT>& A = UA.M;
+ const Mat<eT>& B = UB.M;
+ const Mat<eT>& C = UC.M;
+ const Mat<eT>& D = UD.M;
+
+ const uword out_n_rows = A.n_rows + B.n_rows + C.n_rows + D.n_rows;
+ const uword out_n_cols = (std::max)(((std::max)((std::max)(A.n_cols, B.n_cols), C.n_cols)), D.n_cols);
+
+ arma_debug_check( ((A.n_cols != out_n_cols) && ((A.n_rows > 0) || (A.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+ arma_debug_check( ((B.n_cols != out_n_cols) && ((B.n_rows > 0) || (B.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+ arma_debug_check( ((C.n_cols != out_n_cols) && ((C.n_rows > 0) || (C.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+ arma_debug_check( ((D.n_cols != out_n_cols) && ((D.n_rows > 0) || (D.n_cols > 0))), "join_cols() / join_vert(): number of columns must be the same" );
+
+ out.set_size(out_n_rows, out_n_cols);
+
+ if(out.n_elem == 0) { return; }
+
+ uword row_start = 0;
+ uword row_end_p1 = 0;
+
+ if(A.n_elem > 0) { row_end_p1 += A.n_rows; out.rows(row_start, row_end_p1 - 1) = A; }
+
+ row_start = row_end_p1;
+
+ if(B.n_elem > 0) { row_end_p1 += B.n_rows; out.rows(row_start, row_end_p1 - 1) = B; }
+
+ row_start = row_end_p1;
+
+ if(C.n_elem > 0) { row_end_p1 += C.n_rows; out.rows(row_start, row_end_p1 - 1) = C; }
+
+ row_start = row_end_p1;
+
+ if(D.n_elem > 0) { row_end_p1 += D.n_rows; out.rows(row_start, row_end_p1 - 1) = D; }
+ }
+
+
+
+template<typename T1, typename T2>
+inline
+void
+glue_join_rows::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& A, const Proxy<T2>& B)
+ {
+ arma_extra_debug_sigprint();
+
+ const uword A_n_rows = A.get_n_rows();
+ const uword A_n_cols = A.get_n_cols();
+
+ const uword B_n_rows = B.get_n_rows();
+ const uword B_n_cols = B.get_n_cols();
+
+ arma_debug_check
+ (
+ ( (A_n_rows != B_n_rows) && ( (A_n_rows > 0) || (A_n_cols > 0) ) && ( (B_n_rows > 0) || (B_n_cols > 0) ) ),
+ "join_rows() / join_horiz(): number of rows must be the same"
+ );
+
+ out.set_size( (std::max)(A_n_rows, B_n_rows), A_n_cols + B_n_cols );
+
+ if( out.n_elem > 0 )
+ {
+ if(A.get_n_elem() > 0)
+ {
+ out.submat(0, 0, out.n_rows-1, A_n_cols-1) = A.Q;
+ }
+
+ if(B.get_n_elem() > 0)
+ {
+ out.submat(0, A_n_cols, out.n_rows-1, out.n_cols-1) = B.Q;
+ }
+ }
+ }
+
+
+
+
+template<typename T1, typename T2>
+inline
+void
+glue_join_rows::apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_join_rows>& X)
+ {
+ arma_extra_debug_sigprint();
+
+ typedef typename T1::elem_type eT;
+
+ const Proxy<T1> A(X.A);
+ const Proxy<T2> B(X.B);
+
+ if( (A.is_alias(out) == false) && (B.is_alias(out) == false) )
+ {
+ glue_join_rows::apply_noalias(out, A, B);
+ }
+ else
+ {
+ Mat<eT> tmp;
+
+ glue_join_rows::apply_noalias(tmp, A, B);
+
+ out.steal_mem(tmp);
+ }
+ }
+
+
+
+template<typename eT, typename T1, typename T2, typename T3>
+inline
+void
+glue_join_rows::apply(Mat<eT>& out, const Base<eT,T1>& A_expr, const Base<eT,T2>& B_expr, const Base<eT,T3>& C_expr)
+ {
+ arma_extra_debug_sigprint();
+
+ const quasi_unwrap<T1> UA(A_expr.get_ref());
+ const quasi_unwrap<T2> UB(B_expr.get_ref());
+ const quasi_unwrap<T3> UC(C_expr.get_ref());
+
+ const Mat<eT>& A = UA.M;
+ const Mat<eT>& B = UB.M;
+ const Mat<eT>& C = UC.M;
+
+ const uword out_n_rows = (std::max)((std::max)(A.n_rows, B.n_rows), C.n_rows);
+ const uword out_n_cols = A.n_cols + B.n_cols + C.n_cols;
+
+ arma_debug_check( ((A.n_rows != out_n_rows) && ((A.n_rows > 0) || (A.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+ arma_debug_check( ((B.n_rows != out_n_rows) && ((B.n_rows > 0) || (B.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+ arma_debug_check( ((C.n_rows != out_n_rows) && ((C.n_rows > 0) || (C.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+
+ out.set_size(out_n_rows, out_n_cols);
+
+ if(out.n_elem == 0) { return; }
+
+ uword col_start = 0;
+ uword col_end_p1 = 0;
+
+ if(A.n_elem > 0) { col_end_p1 += A.n_cols; out.cols(col_start, col_end_p1 - 1) = A; }
+
+ col_start = col_end_p1;
+
+ if(B.n_elem > 0) { col_end_p1 += B.n_cols; out.cols(col_start, col_end_p1 - 1) = B; }
+
+ col_start = col_end_p1;
+
+ if(C.n_elem > 0) { col_end_p1 += C.n_cols; out.cols(col_start, col_end_p1 - 1) = C; }
+ }
+
+
+
+template<typename eT, typename T1, typename T2, typename T3, typename T4>
+inline
+void
+glue_join_rows::apply(Mat<eT>& out, const Base<eT,T1>& A_expr, const Base<eT,T2>& B_expr, const Base<eT,T3>& C_expr, const Base<eT,T4>& D_expr)
+ {
+ arma_extra_debug_sigprint();
+
+ const quasi_unwrap<T1> UA(A_expr.get_ref());
+ const quasi_unwrap<T2> UB(B_expr.get_ref());
+ const quasi_unwrap<T3> UC(C_expr.get_ref());
+ const quasi_unwrap<T4> UD(D_expr.get_ref());
+
+ const Mat<eT>& A = UA.M;
+ const Mat<eT>& B = UB.M;
+ const Mat<eT>& C = UC.M;
+ const Mat<eT>& D = UD.M;
+
+ const uword out_n_rows = (std::max)(((std::max)((std::max)(A.n_rows, B.n_rows), C.n_rows)), D.n_rows);
+ const uword out_n_cols = A.n_cols + B.n_cols + C.n_cols + D.n_cols;
+
+ arma_debug_check( ((A.n_rows != out_n_rows) && ((A.n_rows > 0) || (A.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+ arma_debug_check( ((B.n_rows != out_n_rows) && ((B.n_rows > 0) || (B.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+ arma_debug_check( ((C.n_rows != out_n_rows) && ((C.n_rows > 0) || (C.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+ arma_debug_check( ((D.n_rows != out_n_rows) && ((D.n_rows > 0) || (D.n_cols > 0))), "join_rows() / join_horiz(): number of rows must be the same" );
+
+ out.set_size(out_n_rows, out_n_cols);
+
+ if(out.n_elem == 0) { return; }
+
+ uword col_start = 0;
+ uword col_end_p1 = 0;
+
+ if(A.n_elem > 0) { col_end_p1 += A.n_cols; out.cols(col_start, col_end_p1 - 1) = A; }
+
+ col_start = col_end_p1;
+
+ if(B.n_elem > 0) { col_end_p1 += B.n_cols; out.cols(col_start, col_end_p1 - 1) = B; }
+
+ col_start = col_end_p1;
+
+ if(C.n_elem > 0) { col_end_p1 += C.n_cols; out.cols(col_start, col_end_p1 - 1) = C; }
+
+ col_start = col_end_p1;
+
+ if(D.n_elem > 0) { col_end_p1 += D.n_cols; out.cols(col_start, col_end_p1 - 1) = D; }
+ }
+
+
+
+template<typename T1, typename T2>
+inline
+void
+glue_join_slices::apply(Cube<typename T1::elem_type>& out, const GlueCube<T1,T2,glue_join_slices>& X)
+ {
+ arma_extra_debug_sigprint();
+
+ typedef typename T1::elem_type eT;
+
+ const unwrap_cube<T1> A_tmp(X.A);
+ const unwrap_cube<T2> B_tmp(X.B);
+
+ const Cube<eT>& A = A_tmp.M;
+ const Cube<eT>& B = B_tmp.M;
+
+ if(A.n_elem == 0) { out = B; return; }
+ if(B.n_elem == 0) { out = A; return; }
+
+ arma_debug_check( ( (A.n_rows != B.n_rows) || (A.n_cols != B.n_cols) ), "join_slices(): size of slices must be the same" );
+
+ if( (&out != &A) && (&out != &B) )
+ {
+ out.set_size(A.n_rows, A.n_cols, A.n_slices + B.n_slices);
+
+ out.slices(0, A.n_slices-1 ) = A;
+ out.slices(A.n_slices, out.n_slices-1) = B;
+ }
+ else // we have aliasing
+ {
+ Cube<eT> C(A.n_rows, A.n_cols, A.n_slices + B.n_slices, arma_nozeros_indicator());
+
+ C.slices(0, A.n_slices-1) = A;
+ C.slices(A.n_slices, C.n_slices-1) = B;
+
+ out.steal_mem(C);
+ }
+
+ }
+
+
+
+//! @}
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