在C语言中,reserve函数通常用于容器类(如vector、string等)的预分配内存空间,其功能包括: 预分配内存空间:reserve函数可以在容器中预分配一定大小的内存空间,以减少动态增加内存空间的开销。 提高性能:由于预分配了足够的内存空间,可以减少频繁的内存分配和释放操作,从而提高程序的性能。 避免动态扩容:通过reserve函数预分...
CRecordVector<constwchar_t*> fileNamePointers; fileNamePointers.Reserve(fileNames.Size());for(i =0; i < fileNames.Size(); i++) fileNamePointers.Add(fileNames[i]); outArchive->SetFolder(NULL); outArchive->SetFiles(L"", &fileNamePointers.Front(), fileNamePointers.Size()); BYTE ac...
m_dTokens.Reserve(1024); m_sBuffer = q.m_sSource;constboolbUtf8 = pTokenizer->IsUtf8(); m_bUtf8 = bUtf8;// tokenize query wordsintiWordsLength =strlen( q.m_sWords.cstr() ); CSphVector<char> dKwBuffer ( iWordsLength ); CSphVector<Keyword_t> dKeywords; dKeywords.Reserve( MA...
c.reserve() //保留适当的容量。 c.size() //返回容器中实际数据的个数。 c1.swap(c2) //将c1和c2元素互换。 swap(c1,c2) //同上操作。 vector<Elem> c //创建一个空的vector。 vector<Elem> c1(c2) //复制一个vector。 vector <Elem> c(n) //创建一个vector,含有n个数据,数据均已缺省构造...
vector<int> v1; v1.reserve(100000); //注释这一行代码,看一下结果差异 for (int i = 0; i < 100000; i++) { v1.push_back(i); if (p != &v1[0]) { p = &v1[0]; num++; } } cout << num << endl; } int main() ...
Reserve multi dimensional vector Reset include/lib path Resolve conversion warning when porting from VS2008 to VS2010 resource file .icon is not in 3.00 format Resource files encoded as UTF-8 do not compile Resources file not getting correctly embedded or linked into assembly at compile time......
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reserve(Int32) 保留存储以确保容器的最小增长容量。 resize(Int32) 将容器中的元素数更改为指定大小。 resize(Int32, TValue) 将容器中的元素数更改为指定大小。 如果新大小大于旧大小,则该方法将追加值为 _Val 的元素。 size() 计算容器中的元素数。 swap(IVector<TValue>) 交换两个容器的内容。 valid...