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- // change stack size, in bytes
- #pragma comment(linker, "/STACK:33777216") // no space !
- // regex
- regex reg(R"[a-z]+");
- string str("couCOU");
- bool match = regex_match(str, reg));
- // builtins
- __gcd(x, y);
- // for __builtin_*, add suffix l for long, ll for long long
- __builtin_ffs(int);// 1 + least significant 1-bit
- // __builtin_ffs(1010b) = 2
- // __builtin_ffs(0) = -1
- __builtin_clz(unsigned int) // number of leading 0-bits
- // __builtin_clz(0..010100) = 27
- // __builtin_clz(0) is undefined
- __builtin_ctz(unsigned int) // number of trailing 0-bits
- // __builtin_ctz(0..010100) = 2
- // __builtin_ctz(0) is undefined
- __builtin_popcount(int) // number of 1-bits
- // __builtin_popcount(0110b) = 2
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