125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
// Copyright (C) 2019-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-options "-std=gnu++2a" }
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// { dg-do run { target c++2a } }
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#include <cmath>
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#ifndef __cpp_lib_interpolate
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# error "Feature-test macro for midpoint and lerp missing"
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#elif __cpp_lib_interpolate != 201902L
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# error "Feature-test macro for midpoint and lerp has wrong value"
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#endif
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#include <limits>
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#include <testsuite_hooks.h>
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void
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test01()
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{
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using lim = std::numeric_limits<double>;
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VERIFY( std::lerp(0.0, 1.0, 0.0) == 0.0 );
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VERIFY( std::lerp(-2.0, 10.0, 1.0) == 10.0 );
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VERIFY( std::lerp(2.0, -10.0, 1.0) == -10.0 );
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VERIFY( std::lerp(-8.0, 10.0, 0.5) == 1.0 );
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VERIFY( std::lerp(-10.0, 10.0, 0.25) == -5.0 );
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VERIFY( std::lerp(10.0, -10.0, 0.375) == 2.5 );
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VERIFY( std::lerp(2.0, 2.0, 200.0) == 2.0 );
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VERIFY( std::lerp(2.0, 4.0, 200.0) == 402.0 );
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VERIFY( std::lerp(2.0, 4.0, -20.0) == -38.0 );
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VERIFY( std::lerp(1.1, 30201.1, 0) == 1.1 );
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VERIFY( std::lerp(1.1, 30201.1, 1) == 30201.1 );
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VERIFY( std::lerp(1.1, -30201.1, 0) == 1.1 );
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VERIFY( std::lerp(1.1, -30201.1, 1) == -30201.1 );
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VERIFY( std::lerp(1.1, 1.1, lim::infinity()) == 1.1 );
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VERIFY( std::isfinite(std::lerp(1.1, 1.1+lim::min(), lim::max())) );
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VERIFY( std::lerp(lim::max(), lim::max(), 1) == lim::max() );
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VERIFY( std::lerp(lim::max(), lim::max()/9e9, 0) == lim::max() );
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VERIFY( std::lerp(lim::max()/9e9, lim::max(), 1) == lim::max() );
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}
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void
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test02()
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{
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using lim = std::numeric_limits<float>;
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VERIFY( std::lerp(0.0f, 1.0f, 0.0f) == 0.0f );
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VERIFY( std::lerp(-2.0f, 10.0f, 1.0f) == 10.0f );
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VERIFY( std::lerp(2.0f, -10.0f, 1.0f) == -10.0f );
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VERIFY( std::lerp(-8.0f, 10.0f, 0.5f) == 1.0f );
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VERIFY( std::lerp(-10.0f, 10.0f, 0.25f) == -5.0f );
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VERIFY( std::lerp(10.0f, -10.0f, 0.375f) == 2.5f );
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VERIFY( std::lerp(2.0f, 2.0f, 200.0f) == 2.0f );
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VERIFY( std::lerp(2.0f, 4.0f, 200.0f) == 402.0f );
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VERIFY( std::lerp(2.0f, 4.0f, -20.0f) == -38.0f );
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VERIFY( std::lerp(1.1f, 30201.1f, 0) == 1.1f );
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VERIFY( std::lerp(1.1f, 30201.1f, 1) == 30201.1f );
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VERIFY( std::lerp(1.1f, -30201.1f, 0) == 1.1f );
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VERIFY( std::lerp(1.1f, -30201.1f, 1) == -30201.1f );
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VERIFY( std::lerp(1.1f, 1.1f, lim::infinity()) == 1.1f );
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VERIFY( std::isfinite(std::lerp(1.1f, 1.1f+lim::min(), lim::max())) );
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VERIFY( std::lerp(lim::max(), lim::max(), 1) == lim::max() );
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VERIFY( std::lerp(lim::max(), lim::max()/9e9f, 0) == lim::max() );
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VERIFY( std::lerp(lim::max()/9e9f, lim::max(), 1) == lim::max() );
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}
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void
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test03()
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{
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using lim = std::numeric_limits<long double>;
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VERIFY( std::lerp(0.0l, 1.0l, 0.0l) == 0.0l );
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VERIFY( std::lerp(-2.0l, 10.0l, 1.0l) == 10.0l );
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VERIFY( std::lerp(2.0l, -10.0l, 1.0l) == -10.0l );
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VERIFY( std::lerp(-8.0l, 10.0l, 0.5l) == 1.0l );
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VERIFY( std::lerp(-10.0l, 10.0l, 0.25l) == -5.0l );
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VERIFY( std::lerp(10.0l, -10.0l, 0.375l) == 2.5l );
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VERIFY( std::lerp(2.0l, 2.0l, 200.0l) == 2.0l );
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VERIFY( std::lerp(2.0l, 4.0l, 200.0l) == 402.0l );
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VERIFY( std::lerp(2.0l, 4.0l, -20.0l) == -38.0l );
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VERIFY( std::lerp(1.1l, 30201.1l, 0) == 1.1l );
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VERIFY( std::lerp(1.1l, 30201.1l, 1) == 30201.1l );
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VERIFY( std::lerp(1.1l, -30201.1l, 0) == 1.1l );
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VERIFY( std::lerp(1.1l, -30201.1l, 1) == -30201.1l );
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VERIFY( std::lerp(1.1l, 1.1l, lim::infinity()) == 1.1l );
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VERIFY( std::isfinite(std::lerp(1.1l, 1.1l+lim::min(), lim::max())) );
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VERIFY( std::lerp(lim::max(), lim::max(), 1) == lim::max() );
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VERIFY( std::lerp(lim::max(), lim::max()/9e9l, 0) == lim::max() );
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VERIFY( std::lerp(lim::max()/9e9l, lim::max(), 1) == lim::max() );
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}
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int main()
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{
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test01();
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test02();
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test03();
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}
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