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// ==========================================================================
// SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Knut Reinert or the FU Berlin nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL KNUT REINERT OR THE FU BERLIN BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//
// ==========================================================================
// Author: Manuel Holtgrewe <manuel.holtgrewe@fu-berlin.de>
// ==========================================================================
// Example program used in the documentation of the metaprogramming functions.
// ==========================================================================
#include <iostream>
#include <seqan/basic.h>
using namespace seqan2;
// Demonstration of using True and False as base classes.
//![inheriting from true false]
template <typename T>
struct IsInt32 :
False {};
template <>
struct IsInt32<int>:
True {};
//![inheriting from true false]
// Helper functions for print tags True/False.
//![true false print helpers]
void printBoolType(True const & /*tag*/)
{
std::cout << "true" << std::endl;
}
void printBoolType(False const & /*tag*/)
{
std::cout << "false" << std::endl;
}
//![true false print helpers]
int main()
{
// Example for using the tags True and False.
//![tags true false]
std::cout << False::VALUE << "\n" // => "0"
<< True::VALUE << "\n" // => "1"
<< IsSameType<False, False::Type>::VALUE << "\n"; // => "1"
//![tags true false]
// And an example for using IsInt32.
//![using isint32]
std::cout << IsInt32<bool>::VALUE << "\n" // => "0"
<< IsInt32<int>::VALUE << "\n"; // => "1"
//![using isint32]
// Demonstration of using Eval.
//![print bool type eval]
printBoolType(Eval<true>::Type()); // => "true"
printBoolType(Eval<false>::Type()); // => "false"
//![print bool type eval]
// Demonstration of using Not.
//![print bool type not]
printBoolType(Not<False>::Type()); // => "true"
printBoolType(Not<True>::Type()); // => "false"
//![print bool type not]
// Demonstration of using NotC.
//![print bool type notc]
printBoolType(NotC<false>::Type()); // => "true"
printBoolType(NotC<true>::Type()); // => "false"
//![print bool type notc]
// Demonstration of using Or.
//![print bool type or]
printBoolType(Or<False, False>::Type()); // => "false"
printBoolType(Or<False, True>::Type()); // => "true"
printBoolType(Or<True, False>::Type()); // => "true"
printBoolType(Or<True, True>::Type()); // => "true"
//![print bool type or]
// Demonstration of using OrC.
//![print bool type orc]
printBoolType(OrC<false, false>::Type()); // => "false"
printBoolType(OrC<false, true>::Type()); // => "true"
printBoolType(OrC<true, false>::Type()); // => "true"
printBoolType(OrC<true, true>::Type()); // => "true"
//![print bool type orc]
// Demonstration of using And.
//![print bool type and]
printBoolType(And<False, False>::Type()); // => "false"
printBoolType(And<False, True>::Type()); // => "true"
printBoolType(And<True, False>::Type()); // => "true"
printBoolType(And<True, True>::Type()); // => "true"
//![print bool type and]
// Demonstration of using AndC.
//![print bool type andc]
printBoolType(AndC<false, false>::Type()); // => "false"
printBoolType(AndC<false, true>::Type()); // => "true"
printBoolType(AndC<true, false>::Type()); // => "true"
printBoolType(AndC<true, true>::Type()); // => "true"
//![print bool type andc]
// Demonstration of using If.
//![print bool type if]
printBoolType(If<True, True, False>::Type()); // => "true"
printBoolType(If<True, False, True>::Type()); // => "false"
//![print bool type if]
// Demonstration of using IfC.
//![print bool type ifc]
printBoolType(If<True, True, False>::Type()); // => "true"
printBoolType(If<True, False, True>::Type()); // => "false"
//![print bool type ifc]
// Demonstration of the shortcut-to-::Type feature.
//![shortcut to type feature]
typedef And<Or<True, False>, True> TResult;
printBoolType(TResult()); // => "true"
//![shortcut to type feature]
return 0;
}
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