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.
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。关于这个话题，新收录的资料提供了深入分析
公安机关向有关单位和个人收集、调取证据时，应当告知其必须如实提供证据，以及伪造、隐匿、毁灭证据或者提供虚假证言应当承担的法律责任。，这一点在新收录的资料中也有详细论述
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