make_pair( T1&& x, T2&& y ); (C++20 起) 创建std::pair 对象,从实参类型推导目标类型。 给定类型 std::decay<T1>::type 为U1,std::decay<T2>::type 为U2,类型 /*V1*/ 和/*V2*/ 定义如下: 如果U1 是std::reference_wrapper<X>,那么 /*V1*/ 是X&;否则 /*V1*/ 是U1。 如果U2 ...
Make declaration order layout (of non-static class data members) mandated (P1847R4) Text encoding changes: Character sets and encodings (P2314R4) Consistent character literal encoding (P2316R2) Named universal character escapes, e.g. "\N{CAT FACE}" for "🐱" (P2071R2) Delimited es...
make_pair 创建一个pair对象,其类型根据各实参类型确定 (函数模板) operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20 移除)(C++20 移除)(C++20 移除)(C++20 移除)(C++20 移除)(C++20) 按字典序比较pair中的值 (函数模板) ...
std::make_pair( a_tran.end(), a_tran.end()) if no such elements exist Average case O(a_tran.count(ke)), worst case O(a_tran.size()) b.bucket_count() size_type The number of buckets that b contains Constant b.max_bucket_count() size_type An upper bound on the number ...
#include <tuple>#include <iostream>#include <string>#include <stdexcept>std::tuple<double,char,std::string>get_student(intid){if(id==0)returnstd::make_tuple(3.8,'A',"Lisa Simpson");if(id==1)returnstd::make_tuple(2.9,'C',"Milhouse Van Houten");if(id==2)returnstd::make_tuple(1....
(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/...
cmake ..See the advanced installation section for configuration options.Run cmake again to build and install the library:cmake --build . sudo cmake --build . --target installSee this section for information on how to use a different installation location....
(42,"Test",-3.14);std::cout<<"Initialized with values: ";print(t2);std::tuple<char,std::string,int>t3(t2);std::cout<<"Implicitly converted: ";print(t3);std::tuple<int,double>t4(std::make_pair(42,3.14));std::cout<<"Constructed from a pair";print(t4);// given Allocator my_...
it provides many of the basic algorithms and data structures of computer science. The STL is a generic library, meaning that its components are heavily parameterized: almost every component in the STL is a template. You should make sure that you understand how templates work in C++ before you...
inta=1;constauto&[x]=std::make_tuple(a);// OK,非悬垂引用auto&[y]=std::make_tuple(a);// 错误,不能绑定 auto& 到右值 std::tupleauto&&[z]=std::make_tuple(a);// 同样 OK decltype(x)指名结构化绑定的被引用类型,其中x代表一个结构化绑定。在元组式的情况下,它是std::tuple_element返回...