function o = vertcat(varargin)

% Overloads the vertcat method for dates objects.
%
% INPUTS
% - varargin [dates]
%
% OUTPUTS
% - o [dates] object containing dates defined in varargin{:}
%
% EXAMPLE 1
%  If A, B and C are dates object the following syntax:
%
%    D = [A; B; C] ;
%
%  Defines a dates object D containing the dates appearing in A, B and C.

% Copyright © 2013-2022 Dynare Team
%
% This code is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare dates submodule is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare.  If not, see <https://www.gnu.org/licenses/>.

if ~all(cellfun(@isdates, varargin))
    error('dates:vertcat:ArgCheck', 'All input arguments must be dates objects.')
end

o = horzcat(varargin{:});

return % --*-- Unit tests --*--

%@test:1
% Define some dates
B1 = '1953Q4';
B2 = '1950Q2';
B3 = '1950Q1';
B4 = '1945Q3';
B5 = '2009Q2';

% Define expected results.
e.time = [1945*4+3; 1950*4+1; 1950*4+2; 1953*4+4; 2009*4+2];
e.freq = 4;

% Call the tested routine.
d = dates(B4,B3,B2);
try
    d = [d; dates(B1); dates(B5)];
    t(1) = true;
catch
    t(1) = false;
end

% Check the results.
if t(1)
    t(2) = dassert(d.time,e.time);
    t(3) = dassert(d.freq,e.freq);
    t(4) = size(e.time,1)==d.ndat();
end

T = all(t);
%@eof:1

%@test:2
% Define some dates
B2 = '1950Q2';
B3 = '1950Q1';
B4 = '1945Q3';

% Call the tested routine.
d = dates(B4,B3,B2);
try
    d = [d; 1];
    t(1) = false;
catch
    t(1) = true;
end

T = all(t);
%@eof:2
