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8178c6c524
Decoupled each `constexpr if` conditions into function using requires clause, which cleaned-up the compare function. Also, added the check for static extents that removes the runtime check.
121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
//
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// Copyright (c) 2018, Cem Bassoy, cem.bassoy@gmail.com
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// Copyright (c) 2019, Amit Singh, amitsingh19975@gmail.com
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// The authors gratefully acknowledge the support of
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// Google and Fraunhofer IOSB, Ettlingen, Germany
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//
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#include <boost/numeric/ublas/tensor.hpp>
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#include <boost/numeric/ublas/matrix.hpp>
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#include <boost/numeric/ublas/vector.hpp>
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#include <ostream>
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int main()
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{
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namespace ublas = boost::numeric::ublas;
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using value = float;
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using tensor = ublas::tensor_dynamic<value>;
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using matrix = ublas::matrix<value>;
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using vector = ublas::vector<value>;
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using shape = tensor::extents_type;
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try {
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auto A = tensor{3,4,2};
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auto B = A = 2;
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// Calling overloaded operators
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// and using simple tensor expression templates.
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if( A != (B+1) ){
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A += 2*B - 1;
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}
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "A=" << A << ";" << std::endl << std::endl;
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auto n = shape{3,4};
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auto D = matrix(n[0],n[1],1);
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auto e = vector(n[1],1);
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auto f = vector(n[0],2);
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// Calling constructor with
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// vector expression templates
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tensor C = 2*f;
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "C=" << C << ";" << std::endl << std::endl;
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// Calling overloaded operators
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// and mixing simple tensor and matrix expression templates
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tensor F = 3*C + 4*prod(2*D,e);
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "F=" << F << ";" << std::endl << std::endl;
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// Calling overloaded operators
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// and mixing expression templates with prvalues, rvalues, and lvalues
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{
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// NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
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auto G = tensor(shape{3,3}, 3.f);
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auto E_9 = G + G + G;
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "E(9)=" << tensor(E_9) << ";" << std::endl << std::endl;
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// NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
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auto E_6 = G + 3.f;
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "E(6)=" << tensor(E_6) << ";" << std::endl << std::endl;
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// NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
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auto const four = 4.f;
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auto E_10 = E_6 + four;
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "E(10)=" << tensor(E_10) << ";" << std::endl << std::endl;
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// NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
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auto E_23 = E_10 + E_10 + tensor(shape{3,3}, 3.f);
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "E(23)=" << tensor(E_23) << ";" << std::endl << std::endl;
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// NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
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auto E_9_7 = tensor(shape{3,3}, 5.4f) + 4.3f;
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// formatted output
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std::cout << "% --------------------------- " << std::endl;
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std::cout << "% --------------------------- " << std::endl << std::endl;
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std::cout << "E(9.7)=" << tensor(E_9_7) << ";" << std::endl << std::endl;
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}
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} catch (const std::exception& e) {
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std::cerr << "Cought exception " << e.what();
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std::cerr << "in the main function of simple expression." << std::endl;
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}
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}
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