tool's suggestions may not always be applicable or optimal
Now you can see why I called the user-defined version good. Once the compiler is required to have a default constructor, it must insert a guard variable and check the state each time you access Instance which adds up to a good amount of code. Please notice that at this point you're looking at code generated with GCC 15 at -O3 and I did not even call SetResolution or GetResolution.
，更多细节参见新收录的资料
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Making Unicode risk measurable
Container Lifecycle