vector::begin (STL/CLR)

项目
06/09/2015

指定受控序列的开头。

    iterator begin();

备注

指定控件成员函数返回序列中的第一个元素的随机访问迭代器，或者除一个空序列的结尾。用于获取一个迭代器，该迭代器指定受控序列的 current 开头，但如果受控序列的长度发生更改，则该迭代器的状态也会发生更改。

示例

// cliext_vector_begin.cpp 
// compile with: /clr 
#include <cliext/vector> 
 
int main() 
    { 
    cliext::vector<wchar_t> c1; 
    c1.push_back(L'a'); 
    c1.push_back(L'b'); 
    c1.push_back(L'c'); 
 
// display initial contents " a b c" 
    for each (wchar_t elem in c1) 
        System::Console::Write(" {0}", elem); 
    System::Console::WriteLine(); 
 
// inspect first two items 
    cliext::vector<wchar_t>::iterator it = c1.begin(); 
    System::Console::WriteLine("*begin() = {0}", *it); 
    System::Console::WriteLine("*++begin() = {0}", *++it); 
 
// alter first two items and reinspect 
    *--it = L'x'; 
    *++it = L'y'; 
    for each (wchar_t elem in c1) 
        System::Console::Write(" {0}", elem); 
    System::Console::WriteLine(); 
    return (0); 
    }