質問編集履歴
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追記
test
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File without changes
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test
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@@ -57,3 +57,45 @@
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set(CMAKE_CXX_STANDARD 20)
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```
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---
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追記:
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`set(CMAKE_CXX_STANDARD 20)`としているのでC++20のはずなのですが、`std::popcount`は使えませんでした。
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IDEが`Change 'popcount' to '__popcount'?`と提案してきたのでそれに合わせたところ、上記のように`ambiguous`となりました。
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```C++
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#include <iostream>
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int main() {
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int a = 0b111000;
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std::cout << std::popcount(a) << "\n";
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}
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```
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```error
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main.cpp:5:21: error: no member named 'popcount' in namespace 'std'; did you mean '__popcount'?
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std::cout << std::popcount(a) << "\n";
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~~~~~^~~~~~~~
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__popcount
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```
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