c++ - 在g++中收到的预期主表达式

Question

该代码可通过VS成功编译，但是将其移植到Linux并使用g++编译时会出错。

template <class Key, class  Value> 
void Dictionary<Key, Value>::set(const Key &key, Value value)
{
    typename Dictionary<Key,Value>::iterator i = this->find(key);
    if (i == this->end())   
    {
        access(&key, &value, eINSERT);
        this->insert(value_type(key, value));       
    }
    else
    {
        access(&key, &i->second, eCLEAR);
        dispose(i->second);
        access(&key, &value, eSET);
        i->second = value;
    }
}

template <class Key, class  Value> class PtrDictionary : public Dictionary<Key, Value>;

class Processor
{
    private:
        ptrdictionary<const string,const type*>         m_Types;

    void Processor::add(const string name, const Type* t)
    {
        if (m_Types.get(name))
            error("Type '"+string(name)+"' already defined", eParseError);

        m_Types.set(name, t); // this is where the error is received
    }
}

错误是:

../Packages/Dictionary.h: In instantiation of 'void Dictionary::set(const Key&, Value) [with Key = const std::basic_string; Value = const AsmLoader::Type*]': Instructions.cpp:94:21: required from here ../Packages/Dictionary.h:79:37: error: expected primary-expression
this->insert(value_type(key, value));

更新:

value_type是std::map中的一个对象，而g++编译代码所需的只是添加以下代码:

typedef typename map<const Key, Value>::value_type value_type;

感谢大家的评论，这是我第一次使用SO，这是一个非常复杂的代码，所以我忘记指定这部分了。

Answer 1

不幸的是，它看起来好像不能以与VS中相同的方式实现。通过研究，我发现:

Can dictionaries be used in c++

他们建议在STL中使用std::map作为C++中的类似方法(不使用.NET)。如果以上链接发生变化，请引用以下提供的答案:

There is a corresponding type in STL, that's called std::map.

It has the same basic functionality as a .NET Dictionary, but the implementation is quite different. std::map is internally based on a red-black tree datastructure, while Dictionary uses a hash table internally.

If you're just looking for something with the same behaviour, std::map will do, but if you have large amounts of data you have to be aware of the different performance characteristics.

**警告-我仍在学习，如果这与您最初提出的问题不符，则深表歉意。希望这可以帮助!