derek.holloway
7502bf64a4
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75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <cmath>
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// constexpr float lerp(float a, float b, float t) noexcept;
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// constexpr double lerp(double a, double b, double t) noexcept;
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// constexpr long double lerp(long double a, long double b, long double t) noexcept;
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#include <cmath>
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#include <limits>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "fp_compare.h"
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template <typename T>
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constexpr bool constexpr_test()
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{
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return std::lerp(T( 0), T(12), T(0)) == T(0)
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&& std::lerp(T(12), T( 0), T(0.5)) == T(6)
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&& std::lerp(T( 0), T(12), T(2)) == T(24);
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}
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template <typename T>
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void test()
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{
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ASSERT_SAME_TYPE(T, decltype(std::lerp(T(), T(), T())));
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LIBCPP_ASSERT_NOEXCEPT( std::lerp(T(), T(), T()));
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// constexpr T minV = std::numeric_limits<T>::min();
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constexpr T maxV = std::numeric_limits<T>::max();
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constexpr T inf = std::numeric_limits<T>::infinity();
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// Things that can be compared exactly
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assert((std::lerp(T( 0), T(12), T(0)) == T(0)));
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assert((std::lerp(T( 0), T(12), T(1)) == T(12)));
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assert((std::lerp(T(12), T( 0), T(0)) == T(12)));
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assert((std::lerp(T(12), T( 0), T(1)) == T(0)));
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assert((std::lerp(T( 0), T(12), T(0.5)) == T(6)));
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assert((std::lerp(T(12), T( 0), T(0.5)) == T(6)));
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assert((std::lerp(T( 0), T(12), T(2)) == T(24)));
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assert((std::lerp(T(12), T( 0), T(2)) == T(-12)));
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assert((std::lerp(maxV, maxV/10, T(0)) == maxV));
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assert((std::lerp(maxV/10, maxV, T(1)) == maxV));
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assert((std::lerp(T(2.3), T(2.3), inf) == T(2.3)));
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assert(std::lerp(T( 0), T( 0), T(23)) == T(0));
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assert(std::isnan(std::lerp(T( 0), T( 0), inf)));
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}
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int main(int, char**)
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{
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static_assert(constexpr_test<float>(), "");
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static_assert(constexpr_test<double>(), "");
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static_assert(constexpr_test<long double>(), "");
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test<float>();
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test<double>();
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test<long double>();
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return 0;
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}
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