我尝试在 VC2010 中编译以下错误代码，但出现错误 C2974 这只发生在我包含 lambda 表达式时，所以我猜它与此有关.
typedef pair, int>adjlist_edge;优先队列，[](adjlist_edge a, adjlist_edge b) ->布尔{if(a.second > b.second){ 返回真；} else { 返回假；}}>adjlist_pq;我知道模板定义的形式是正确的
priority_queue、greater>pq;按预期工作.任何想法我做错了什么?lambda 是否有明显的错误，看起来我可能忽略了?感谢阅读！
首先定义 lambda 对象，然后使用 decltype 将其传递给模板的类型，并直接将其传递给构造函数.
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auto comp = []( adjist a, adjlist b ) { return a.second >b.第二；};优先队列，decltype(comp)>adjlist_pq(comp);I have the following erroneous code which I am trying to compile in VC2010, but I'm getting the error C2974 this only occurs when I include the lambda expression, so I'm guessing it has something to do with that.
typedef pair<pair<int, int>, int> adjlist_edge;
priority_queue< adjlist_edge , vector<adjlist_edge>,
[](adjlist_edge a, adjlist_edge b) -> bool {
if(a.second > b.second){ return true; } else { return false; }
}> adjlist_pq;
I know the form of the template definition is correct as
priority_queue<int , vector<int>, greater<int>> pq;
Works as expected. Any ideas what I'm doing wrong? Is there something obviously wrong with the lambda that looks wrong that I might be overlooking? Thanks for reading!
First define the lambda object, then pass it to the template's type using decltype and also pass it directly to the constructor.
auto comp = []( adjist a, adjlist b ) { return a.second > b.second; };
priority_queue< adjlist_edge , vector<adjlist_edge>, decltype( comp ) >
adjlist_pq( comp );
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