| // { dg-options "-std=gnu++2a" } |
| // { dg-do compile { target c++2a } } |
| |
| #include <cmath> |
| |
| // Fails template argument deduction unless both arguments are the same type. |
| template<typename T> |
| constexpr bool |
| eq(T result, T expected) { return result == expected; } |
| |
| static_assert( eq( std::lerp(-10.0, 10.0, 0.25), -5.0 ) ); |
| static_assert( eq( std::lerp(2.0f, 2.0f, 200.0f), 2.0f ) ); |
| static_assert( eq( std::lerp(2.0L, 4.0L, 200.0L), 402.0L ) ); |
| // at least one type is long double, so result is long double |
| static_assert( eq( std::lerp(2.0L, 4.0f, -20.0), -38.0L ) ); |
| // at least one type is double, so result is double: |
| static_assert( eq( std::lerp(-8.0f, 10.0, 0.5f), 1.0 ) ); |
| // int promotes to double, so result is double |
| static_assert( eq( std::lerp(0, 1, 0), 0.0 ) ); |
| // int promotes to double, so result is double |
| static_assert( eq( std::lerp(2.0f, -10.0f, 1), -10.0 ) ); |
