9.关联容器的删除操作: 对于保存不重复关键字的容器,erase的返回值总是0或1,若返回0.则表面想要删除的元素并不在容器中。 对于重复关键字的容器,删除元素的数量可能大于1。 10.关联容器的下标操作: 当对一个map进行下标操作时,会获得一个mapped_type对象,但当解引用一个map迭代器时,会得到一个value_type对象。
(vec4); //6、删除前0-9下标之间的元素 std::cout << "删除前0-9下标之间的元素的结果:"; vec4.erase(vec4.begin(), vec4.begin() + 10); show<int>(vec4); //7、扩容,扩大空间,并初始化为0 std::cout << "原来大小:" << vec4.size() << std::endl; vec4.resize(20); std::...
map<int, int>::iterator it2 = mymap.begin(); mymap.erase(++it2); std::cout << "删除第2个元素:"; show(mymap); //7、删除键值1对应的值 mymap.erase(1); std::cout << "删除键值1对应的值:"; show(mymap); //8、删除0-3区间的元素,即0,1,2下标的 std::map<int, int>::...
关联容器支持高效的关键字查找和访问。两个主要的关联容器(associative container)类型是map和set。map中的元素是一些关键字---值(key--value)对:关键字起到索引的作用,值则表示与索引相关联的数据。set中每个元素只包含一个关键字:set支持高效的关键字查询操作---检查一个给定关键字是否在set中。 标准库提供set...
set和map提供的 iterators是 ForwardIterator, 关于STL中iterator迭代器的操作如下: 只有顺序容器和关联容器支持迭代器遍历,各容器支持的迭代器的类别如下: 容器 支持的迭代器类别 vector 随机访问 deque 随机访问 set 双向 multimap 双向 multiset 双向 list 双向 ...
} UDP的侦听是在 listen_stream_caster() 中 intSrsServer::listen_stream_caster() {intret =ERROR_SUCCESS; #ifdef SRS_AUTO_STREAM_CASTER close_listeners(SrsListenerMpegTsOverUdp); std::vector<SrsConfDirective*>::iterator it; std::vector<SrsConfDirective*> stream_casters = _srs_config->get_st...
// Singleton<ThreadRegistry>::Extant()->Erase(this); if(dameon_ != nullptr) daemon_->ThreadDeleted(this); systhrd_.reset(); } Receiving a Windows Structured Exception As previously mentioned, we register SE_Handler to map each Windows exception to a POSIX signal: C++ // Converts a Wi...
multimap rbegin in C STL - In this article we will be discussing the working, syntax, and examples of multimap::rbegin() function in C++ STL.What is Multimap in C++ STL?Multimaps are the associative containers, which are similar to map containers. It als
Rabbits in Forest in C - Suppose In a forest, each rabbit has some color. Now some subset of rabbits (possibly all of them) will tell us how many other rabbits have the same color as them. Those answers are placed in an array. We have to find the minimu
#include <map> usingnamespacestd; intmain() { try{ map<char,int>mymap; map<char,int>::iteratorit; mymap['a']=50; mymap['b']=100; mymap['c']=150; mymap['d']=200; it=mymap.find('b'); mymap.erase(it); mymap.erase(mymap.find('d')); ...