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declval作用：返回模板参数类型的右值引用 decltype作用：起别名 #include <utility> using namespace std; class A{}; class B{ public: A m; } decltype(declval<B>().m) n1; 阅读全文
posted @ 2021-08-02 21:15
Acception
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常用: using T = typename remove_reference<decltype(*declval<it>())>::type; template <typename T> class remove_reference { public: typedef T type; }; tem 阅读全文
posted @ 2021-08-02 02:32
Acception
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int __builtin_clz(unsigned long long int a){ int res=0; while(!(a&0x80000000)){///0x80000000 = 1ll<<31 res++; a<<=1; } return res; } 阅读全文
posted @ 2021-08-02 02:02
Acception
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A. Gregor and Cryptography 构造... #include <bits/stdc++.h> #define all(a) a.begin(),a.end() #define pb push_back using namespace std; using ll = long l 阅读全文
posted @ 2021-08-02 01:51
Acception
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