set容器erase怎么不行呢????

[mirroatl143]

 set<int> g_TexMoveRegain;
g_TexMoveRegain.insert(1);
g_TexMoveRegain.insert(2);
g_TexMoveRegain.insert(3);

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ++it){
                         if(*it == _id)
                         {
						g_TexMoveRegain.erase(it);
			}
}

[幻夢之葉]

引用 4 楼 mirroatl143 的回复:

失效是什么意思??? [quote=引用 3 楼 jianwen0529 的回复:] [quote=引用 2 楼 jianwen0529 的回复:] for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { it = g_TexMoveRegain.erase(iterToBeDeleted); }

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { if(...) it = g_TexMoveRegain.erase(iterToBeDeleted); else ++it; } 插入删除元素会使迭代器失效！！去看一下相关概念！！[/quote][/quote] 失效的意思就是迭代器变化了，不是原来的了！ 你删除一个元素 g_TexMoveRegain.erase(iterToBeDeleted);返回一个迭代器，指向下一个元素，如果没有则会指向end() std::set<int>::iterator iterToBeDeleted= it++; g_TexMoveRegain.erase(iterToBeDeleted); 1L的就是先使迭代器指向下一个元素 然后再删除原来的元素 跟我写的it = g_TexMoveRegain.erase(iterToBeDeleted);这句是一样效果的！

[arsenduan]

楼主用法有误， erase(iter)后， iter失效，再做++iter会导致意想不到的错误 建议用while(***){erase(iter++);}这样的用法

[poy49295]

set<int> g_TexMoveRegain; g_TexMoveRegain.insert(1); g_TexMoveRegain.insert(2); g_TexMoveRegain.insert(3); for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ){ if(*it == _id) { std::set<int>::iterator iterToBeDeleted= it++; g_TexMoveRegain.erase(iterToBeDeleted); } else { ++it; } }

[幻夢之葉]

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { it = g_TexMoveRegain.erase(iterToBeDeleted); }

[幻夢之葉]

引用 2 楼 jianwen0529 的回复:

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { it = g_TexMoveRegain.erase(iterToBeDeleted); }

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { if(...) it = g_TexMoveRegain.erase(iterToBeDeleted); else ++it; } 插入删除元素会使迭代器失效！！去看一下相关概念！！

[mirroatl143]

失效是什么意思???

引用 3 楼 jianwen0529 的回复:

[quote=引用 2 楼 jianwen0529 的回复:] for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { it = g_TexMoveRegain.erase(iterToBeDeleted); }

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ) { if(...) it = g_TexMoveRegain.erase(iterToBeDeleted); else ++it; } 插入删除元素会使迭代器失效！！去看一下相关概念！！[/quote]

[mirroatl143]

for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ++it){
                         if(*it == _id)
                         {
                        g_TexMoveRegain.erase(it);
            }
}
我这写的和你有区别吗???

引用 1 楼 poy49295 的回复:

set<int> g_TexMoveRegain; g_TexMoveRegain.insert(1); g_TexMoveRegain.insert(2); g_TexMoveRegain.insert(3); for(std::set<int>::iterator it = g_TexMoveRegain.begin(); it != g_TexMoveRegain.end(); ){ if(*it == _id) { std::set<int>::iterator iterToBeDeleted= it++; g_TexMoveRegain.erase(iterToBeDeleted); } else { ++it; } }

[赵4老师]

http://www.cplusplus.com

[yangyunzhao]

百度一下，在循环中删除迭代器，会有惊喜哦