std::size_t 可以存放下理论上可能存在的对象的最大大小,该对象可以是任何类型(包括数组)。大小无法以 std::size_t 表示的类型是非良构的。在许多平台上(使用分段寻址的系统除外),std::size_t 可以存放任何非成员的指针的值,此时它与 std::uintptr_t 同义。
1)c.size() 2)static_cast<std::common_type_t<std::ptrdiff_t, std::make_signed_t<decltype(c.size())>>>(c.size()) 3,4)N 异常 1,2)可能会抛出由实现定义的异常。 重载 可以为未暴露适合的size()成员函数的类或枚举提供size的自定义重载,从而能检测它。
std::size_t mbrtowc( wchar_t* pwc, const char* s, std::size_t n, std::mbstate_t* ps ); Converts a narrow multibyte character to a wide character. If s is not a null pointer, inspects at most n bytes of the multibyte character string, beginning with the byte pointed to by ...
); (1) int fprintf( std::FILE* stream, const char* format, ... ); (2) int sprintf( char* buffer, const char* format, ... ); (3) int snprintf( char* buffer, std::size_t buf_size, const char* format, ... ); (4) (since C++11) ...
size_typeUnsigned integer type (usuallystd::size_t) difference_typeSigned integer type (usuallystd::ptrdiff_t) referencevalue_type& const_referenceconstvalue_type& pointer Allocator::pointer (until C++11) std::allocator_traits<Allocator>::pointer ...
size_type size()const; (noexcept since C++11) Returns the number of elements in the container, i.e.std::distance(begin(), end()). Return value The number of elements in the container. Complexity Constant. Example The following code usessizeto display the number of elements in astd::deque...
template<class T,std::size_t N> struct array; 自C++11开始有的。 简介 std::array是一个封装固定大小数组的容器。 这种容器型别其语义与只含有一笔以T[N]表示之C风格阵列做为它唯一非静态数据成员之struct相同。和C-style 数组不同的地方在于它不会自动衰减至类型T*。作为聚集类别,可以使用最多N个可转...
int stoi( const std::string& str, std::size_t* pos = 0, int base = 10 );int stoi( const std::wstring& str, std::size_t* pos = 0, int base = 10 );(1) (C++11 起)long stol( const std::string& str, std::size_t* pos = 0, int base = 10 );long stol( const std:...
namespace oneapi::mkl::rng::device { template<std::int32_t VecSize = 1> class mcg59 { public: static constexpr std::uint32_t default_seed = 1; static constexpr std::int32_t vec_size = VecSize; mcg59() : mcg59(default_seed) {} mcg59(std::uint32_t seed, std::uint64_t of...
()<<", "<<lcps.consumerGroupCheckpoints[i].GetUpdateTime()<<endl; } while(true){ HeartbeatResponse resp = ptr->ConsumerGroupHeartbeat(project, logstore, "hahhah", "cc1", std::vector<uint32_t>()); cout<<"cc1, heartbeat: "; for(std::vector<uint32_t>::const_iterator it = ...