回答編集履歴
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@@ -3,3 +3,51 @@
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`::`はグローバル名前空間にある、という意味合いですね。
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```
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#include <new>
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int main()
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{
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::operator new(sizeof(int));
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}
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```
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```
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prog.cc: In function 'int main()':
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prog.cc:5:17: warning: ignoring return value of 'void* operator new(std::size_t)', declared with attribute 'nodiscard' [-Wunused-result]
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5 | ::operator new(sizeof(int));
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| ~~~~~~~~~~~~~~^~~~~~~~~~~~~
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In file included from prog.cc:1:
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/opt/wandbox/gcc-10.1.0/include/c++/10.1.0/new:126:26: note: declared here
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126 | _GLIBCXX_NODISCARD void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
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| ^~~~~~~~
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```
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[https://wandbox.org/permlink/AMdyESvpojzWE8iu](https://wandbox.org/permlink/AMdyESvpojzWE8iu)
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この警告文見たほうがわかりやすいかな？
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