花括号上的崩溃:调试断言失败

在VS2008、C++中,我有一段代码在调试模式下运行。

表达式:\块\类型\有效(pHead->(使用)

我不明白为什么要用花括号?这对你们有意义吗?

for(int e=0; e<mesh->edges.size(); e++)
{
    if(mesh->edges[e].valid && mesh->edges[e].v[0]>=0 && mesh->edges[e].v[1]>=0 &&
        mesh->points[mesh->edges[e].v[0]].writable && mesh->points[mesh->edges[e].v[1]].writable)
    {
        //update v_hat and its corresponding error
        DecEdge Current = DecEdge(e);
        pair<Point, float> ppf = computeVhat(e);
        Current.v_hat = ppf.first;
        Current.error = ppf.second;

        edgeSoup.push(Current);
        mesh->edges[e].needsUpdate=false;
    }
}