52 lines
1.1 KiB
Text
52 lines
1.1 KiB
Text
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// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/Cache.cppm -o %t/Cache.pcm
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// RUN: %clang_cc1 -std=c++20 %t/Use.cpp -fmodule-file=Fibonacci.Cache=%t/Cache.pcm \
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// RUN: -fsyntax-only -verify
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//--- Cache.cppm
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export module Fibonacci.Cache;
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export namespace Fibonacci
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{
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constexpr unsigned long Recursive(unsigned long n)
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{
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if (n == 0)
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return 0;
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if (n == 1)
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return 1;
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return Recursive(n - 2) + Recursive(n - 1);
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}
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template<unsigned long N>
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struct Number{};
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struct DefaultStrategy
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{
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constexpr unsigned long operator()(unsigned long n, auto... other) const
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{
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return (n + ... + other);
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}
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};
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constexpr unsigned long Compute(Number<10ul>, auto strategy)
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{
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return strategy(Recursive(10ul));
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}
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template<unsigned long N, typename Strategy = DefaultStrategy>
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constexpr unsigned long Cache = Compute(Number<N>{}, Strategy{});
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template constexpr unsigned long Cache<10ul>;
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}
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//--- Use.cpp
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// expected-no-diagnostics
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import Fibonacci.Cache;
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constexpr bool value = Fibonacci::Cache<10ul> == 55;
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static_assert(value == true, "");
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