c++ - 从键的 vector 中删除一个值

Question

我有一张 map typedef map<int32_t,std::vector<int32_t>> myMap

我在 vector 中添加了一个关于键的值，例如

myMap[somePointer->getVal()].push_back(Id1);
myMap[somePointer->getVal()].push_back(Id2);
myMap[somePointer->getVal()].push_back(Id3);
myMap[somePointer->getVal()].push_back(Id4);

如果我想从键的 vector 中删除一个值怎么办？我试着做 myMap[somePointer->getVal()].erase(Id1)

但是这个编译器会报错。

Answer 1

尝试删除第 x+1 个元素

myMap[somePointer->getVal()].erase (myMap[somePointer->getVal()].begin()+x);