小编cat*_*una的帖子

我想将不同类型的 unique_ptr 存储在向量中。

我尝试按如下方式使用 std::any 。

#include <vector>
#include <any>
#include <memory>

class A
{
   int val;
};

class B
{
   float val;
};


int main()
{
    std::vector<std::any> vec;
    
    auto a = new A();
    auto b = new B();
    
    vec.push_back(std::unique_ptr<A>(a));
    vec.push_back(std::unique_ptr<B>(b));
}

它失败如下。

main.cpp: In function 'int main()':
main.cpp:23:18: error: no matching function for call to 'std::vector<std::any>::push_back(std::unique_ptr<A>)'
   23 |     vec.push_back(std::unique_ptr<A>(a));
      |     ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/vector:64,
                 from main.cpp:1:
/usr/local/include/c++/12.1.0/bits/stl_vector.h:1276:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::any; …