rand std::rand Defined in header<cstdlib> intrand(); Returns a pseudo-random integral value from the range[0,RAND_MAX]. std::srand()seeds the pseudo-random number generator used byrand(). Ifrand()is used
rand std::rand Defined in header<cstdlib> intrand(); Returns a pseudo-random integral value from the range[0,RAND_MAX]. std::srand()seeds the pseudo-random number generator used byrand(). Ifrand()is used before any calls tostd::srand(),rand()behaves as if it was seeded ...
以值seed 播种std::rand() 所用的随机数生成器。 若在对 srand() 的任何调用前使用了 std::rand(),则 std::rand() 表现为如同它被以 srand(1) 播种。 每次以同一 seed 播种std::rand() 时,它必须产生相同的值数列。 srand() 不保证为线程安全。
template<classRandomIt>voidrandom_shuffle(RandomIt first, RandomIt last){typedeftypenamestd::iterator_traits<RandomIt>::difference_typediff_t;for(diff_t i=last-first-1;i>0;--i){usingstd::swap;swap(first[i], first[std::rand()%(i+1)]);// rand() % (i + 1) is not actually corre...
External Links−Non-ANSI/ISO Libraries−Index−std Symbol Index C reference C89,C95,C99,C11,C17,C23│Compiler supportC99,C23 Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support ...
valarray numeric arrays and array slices (class template) Generic numeric operations The headerrandomdefinespseudo-random number generators and numerical distributions. The headercstdlibalso includes C-style random number generation viastd::srandandstd::rand. ...
if((rand() % 10) == 0) { destU32_2.resize((origCount >> 2) + 2); off2 = getStretchNaive(destU32_2.wbuf(), tidx, origToff, origCount); dest_2 = ((uint8_t*)destU32_2.wbuf()) + off2; } #endif destU32[0] = 0x04040404; // Add Ns, which we might end up usi...
2) 构造新的 std::random_device 对象,若提供则以实现定义行为利用实参 token。3) 复制构造函数被弃置:std::random_device 不可复制或移动。异常失败时抛出从 std::exception 派生的实现定义异常。 注解libstdc++ 中的实现期待 token 指名随机字节的源。可能的记号值包括 "default"、"rand_s"、"rdseed"、"...
rand srand RAND_MAX std::random_device Member functions random_device::random_device (C++11) Generation random_device::operator() (C++11) Characteristics random_device::entropy (C++11) random_device::min (C++11) random_device::max (C++11) static constexpr result_type min(); (since C++11)...
RAND_MAX std::random_device Member functions random_device::random_device (C++11) Generation random_device::operator() (C++11) Characteristics random_device::entropy (C++11) random_device::min (C++11) random_device::max (C++11) static constexpr result_type max(); (since C++11) Returns ...