1// RUN: rm -rf %t 2// RUN: mkdir -p %t 3// RUN: split-file %s %t 4// 5// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/Cache.cppm -o %t/Cache.pcm 6// RUN: %clang_cc1 -std=c++20 %t/Use.cpp -fmodule-file=Fibonacci.Cache=%t/Cache.pcm \ 7// RUN: -fsyntax-only -verify 8 9// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/Cache.cppm -o %t/Cache.pcm 10// RUN: %clang_cc1 -std=c++20 %t/Use.cpp -fmodule-file=Fibonacci.Cache=%t/Cache.pcm \ 11// RUN: -fsyntax-only -verify 12 13//--- Cache.cppm 14export module Fibonacci.Cache; 15 16export namespace Fibonacci 17{ 18 constexpr unsigned long Recursive(unsigned long n) 19 { 20 if (n == 0) 21 return 0; 22 if (n == 1) 23 return 1; 24 return Recursive(n - 2) + Recursive(n - 1); 25 } 26 27 template<unsigned long N> 28 struct Number{}; 29 30 struct DefaultStrategy 31 { 32 constexpr unsigned long operator()(unsigned long n, auto... other) const 33 { 34 return (n + ... + other); 35 } 36 }; 37 38 constexpr unsigned long Compute(Number<10ul>, auto strategy) 39 { 40 return strategy(Recursive(10ul)); 41 } 42 43 template<unsigned long N, typename Strategy = DefaultStrategy> 44 constexpr unsigned long Cache = Compute(Number<N>{}, Strategy{}); 45 46 template constexpr unsigned long Cache<10ul>; 47} 48 49//--- Use.cpp 50// expected-no-diagnostics 51import Fibonacci.Cache; 52 53constexpr bool value = Fibonacci::Cache<10ul> == 55; 54 55static_assert(value == true, ""); 56