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c++ - 编译器错误：'std::array<...>::~array()' 被隐式删除

问题描述

我有以下.hpp文件：

#ifndef CODE_HPP
#define CODE_HPP
#include <array>
#include <vector>
using std::vector;
using std::array;

template<typename T, typename C = vector<T>>
class stack;

template<typename T, typename C = vector<T>, typename K = stack<T,C>>
class stack_array;

template<typename T, typename C>
class stack
{
    C pile;

    stack();
    ~stack();
    void push(T&);
    friend class stack_array<T,C,stack<T,C>>;
};


template<typename T, typename C, typename K>
class stack_array
{
    private:
        static const size_t max_elem = 10;
        array<K, max_elem> store{};
        size_t index;
    public:
        stack_array(T&);
        ~stack_array();
};


template<typename T, typename C> stack<T,C>::stack(){
    pile.clear();
}

template<typename T, typename C> stack<T,C>::~stack(){
}

template<typename T, typename C> void stack<T,C>::push(T& _data){
    pile.push_back(_data);

    return;
}

template<typename T, typename C, typename K> stack_array<T,C,K>::stack_array(T& _data){

    index = 0;

    store[index].push(_data);
}

template<typename T, typename C, typename K> stack_array<T,C,K>::~stack_array(){
}

#endif

我的.cpp文件复制如下：

#include "code.hpp"
#include <iostream>
using std::cout;

int main (void){

    auto i = 0;
    stack_array<decltype(i)> s_a(i);

    return 0;
}

当使用以下命令编译上述代码时：

g++ -ggdb -std=c++17 -Wall main.cpp code.hpp

我收到以下编译错误：

In file included from main.cpp:1:0:
code.hpp: In instantiation of ‘stack_array<T, C, K>::stack_array(T&) [with T = int; C = std::vector<int, std::allocator<int> >; K = stack<int, std::vector<int, std::allocator<int> > >]’:
main.cpp:8:35:   required from here
code.hpp:52:86: error: use of deleted function ‘std::array<stack<int, std::vector<int, std::allocator<int> > >, 10>::~array()’
 template<typename T, typename C, typename K> stack_array<T,C,K>::stack_array(T& _data){
                                                                                      ^
In file included from code.hpp:3:0,
                 from main.cpp:1:
/usr/lib/gcc/x86_64-pc-cygwin/7.4.0/include/c++/array:94:12: note: ‘std::array<stack<int, std::vector<int, std::allocator<int> > >, 10>::~array()’ is implicitly deleted because the default definition would be ill-formed:
     struct array
            ^~~~~

为什么std::array因为里面的代码而被调用的析构函数stack_array<T,C,K>::stack_array()?

标签： c++templatescompiler-errors

解决方案

你应该加std::array为好友

template<typename T, typename C>
class stack
{
    C pile;

    stack();
    ~stack();
    void push(T&);
    friend class stack_array<T,C,stack<T,C>>;

    template< class TT, std::size_t N>  friend class std::array ;
};

演示：https ://wandbox.org/permlink/TxAyRCvrwj9CtOhV

消息说：std::array<stack<int, std::vector<int, std::allocator<int> > >, 10>::~array()’ is implicitly deleted...

所以你有一个std::arrayof stack<smt>，std::array应该可以删除stack或者它的析构函数是私有的=>数组的析构函数被隐式删除。

因此，您必须std::array通过将其公开或成为朋友来使其易于访问。

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