DiscreteSample() の戻り値のコピーを回避 (#1275)

Siv3D · Nov 28, 2024 · 53a103e · 53a103e
1 parent 458bec9
commit 53a103e
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Showing 2 changed files with 8 additions and 8 deletions.
diff --git a/Siv3D/include/Siv3D/DiscreteDistribution.hpp b/Siv3D/include/Siv3D/DiscreteDistribution.hpp
@@ -76,19 +76,19 @@ namespace s3d
 
 	template <class Iterator, class URBG>
 	[[nodiscard]]
-	inline auto DiscreteSample(Iterator begin, Iterator end, DiscreteDistribution& weight, URBG&& urbg);
+	inline decltype(auto) DiscreteSample(Iterator begin, Iterator end, DiscreteDistribution& weight, URBG&& urbg);
 
 	template <class Iterator>
 	[[nodiscard]]
-	inline auto DiscreteSample(Iterator begin, Iterator end, DiscreteDistribution& weight);
+	inline decltype(auto) DiscreteSample(Iterator begin, Iterator end, DiscreteDistribution& weight);
 
 	template <class Container, class URBG>
 	[[nodiscard]]
-	inline auto DiscreteSample(const Container& c, DiscreteDistribution& weight, URBG&& urbg);
+	inline decltype(auto) DiscreteSample(const Container& c, DiscreteDistribution& weight, URBG&& urbg);
 
 	template <class Container>
 	[[nodiscard]]
-	inline auto DiscreteSample(const Container& c, DiscreteDistribution& weight);
+	inline decltype(auto) DiscreteSample(const Container& c, DiscreteDistribution& weight);
 
 	template <class Type, class URBG>
 	[[nodiscard]]

diff --git a/Siv3D/include/Siv3D/detail/DiscreteDistribution.ipp b/Siv3D/include/Siv3D/detail/DiscreteDistribution.ipp
@@ -73,7 +73,7 @@ namespace s3d
 	}
 
 	template <class Iterator, class URBG>
-	inline auto DiscreteSample(Iterator begin, [[maybe_unused]] Iterator end, DiscreteDistribution& weight, URBG&& urbg)
+	inline decltype(auto) DiscreteSample(Iterator begin, [[maybe_unused]] Iterator end, DiscreteDistribution& weight, URBG&& urbg)
 	{
 		assert(begin != end);
 		assert(std::distance(begin, end) == static_cast<int64>(weight.size()));
@@ -83,13 +83,13 @@ namespace s3d
 	}
 
 	template <class Iterator>
-	inline auto DiscreteSample(Iterator begin, Iterator end, DiscreteDistribution& weight)
+	inline decltype(auto) DiscreteSample(Iterator begin, Iterator end, DiscreteDistribution& weight)
 	{
 		return DiscreteSample(begin, end, weight, GetDefaultRNG());
 	}
 
 	template <class Container, class URBG>
-	inline auto DiscreteSample(const Container& c, DiscreteDistribution& weight, URBG&& urbg)
+	inline decltype(auto) DiscreteSample(const Container& c, DiscreteDistribution& weight, URBG&& urbg)
 	{
 		assert(std::size(c) != 0);
 		assert(std::size(c) == weight.size());
@@ -100,7 +100,7 @@ namespace s3d
 	}
 
 	template <class Container>
-	inline auto DiscreteSample(const Container& c, DiscreteDistribution& weight)
+	inline decltype(auto) DiscreteSample(const Container& c, DiscreteDistribution& weight)
 	{
 		return DiscreteSample(c, weight, GetDefaultRNG());
 	}