std::make_unique,std::make_unique_for_overwrite C++ Memory management library std::unique_ptr Defined in header<memory> (1) template<classT,class...Args> unique_ptr<T>make_unique(Args&&...args); (since C++14) (until C++23) (only for non-array types) ...
std::experimental::unique_resource<std::decay_t<R>, std::decay_t<D>> make_unique_resource_checked( R&& r, const S& invalid, D&& d ) noexcept(/*see below*/); (library fundamentals TS v3) Creates a unique_resource, initializes its stored resource handle is initialized with std::for...
new/delete 消除 constexpr 函数上放松的限制 二进制字面量 数位分隔符 函数的返回类型推导 带默认成员初始化器的聚合类。 新库功能特性 std::make_unique std::shared_timed_mutex与std::shared_lock std::integer_sequence std::exchange std::quoted ...
scope_exit−scope_fail−scope_success−unique_resource Parallelism library extensions v2 (parallelism TS v2) simd Concurrency library extensions (concurrency TS) Transactional Memory(TM TS) Reflection(reflection TS) External Links−Non-ANSI/ISO Libraries−Index−std Symbol Index ...
使用默认初始化的智能指针创建(如 make_unique_for_overwrite) (FTM)* P1020R1P1973R1 11*12* 16 19.28 (16.9)* 15.0.0* 杂项constexpr 小部分 (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* (FTM)* P1032R1 10 13 19.28 (16.8)* 13.1.6* 移除std::span 的比较运算符 P1085R2 10 8 19.26* 10...
(http://en.cppreference.com/w/cpp/memory/unique_ptr/make_unique): <urlopen error [Errno 101] Network is unreachable> URL failed (http://en.cppreference.com/w/cpp/memory/weak_ptr): <urlopen error [Errno 101] Network is unreachable> URL failed (http://en.cppreference.com/w/cpp/...
分析其原因是:如果未使用 UNIQUE 属性创建聚集索引,数据库引擎将向表自动添加一个四字节 uniqueifier 列。必要时,数据库引擎 将向行自动添加一个 uniqueifier 值,使每个键唯一。此列和列值供内部使用,用户不能查看或访问。 第三:是不是聚集索引就一定要比非聚集索引性能优呢? 如果想查询学分在60-90之间的学生...
Hazelcast flake_id_generator is used to generate cluster-wide unique identifiers. Generated identifiers are long primitive values and are k-ordered (roughly ordered). IDs are in the range from 0 to 2^63-1 (maximum signed long value). For details, see the flake_id_generator section in the ...
unique_ptr // 创建方式1:使用 make_unique (C++14) auto p1 = std::make_unique<int>(42); // 创建方式2:直接构造 std::unique_ptr<int> p2(new int(42)); // 访问资源 std::cout << *p1 << std::endl; *p1 = 100; // 获取原始指针(不转移所有权) int* raw = p1.get(); // 释...
obtains a pointer to the value of a pointed-to variant given the index or the type (if unique), returns null on error (function template) operator==operator!=operator<operator<=operator>operator>= (C++17) comparesvariantobjects as their contained values ...