Std :: string with highlighting enabled

I have an allocator that allocates memory based on its instance variable MemoryContext

. I tried to create an std::string

allocator for this type. The header looks like this

class String {
private:
    std::basic_string< char
                        , std::char_traits<char>
                        , MemoryContextAllocator<char> >  my_string;

public:
    explicit String( MemoryContext* memoryContext );
    ~String();
    MemoryContextAllocator<char> getAllocator() const;

};

      

        
        
        
      

    

The source looks like this

String::String(MemoryContext* memoryContext)
:my_string( MemoryContextAllocator<char>(memoryContext) )
{
}

String::~String() {
}

      

        
        
        
      

    

At compile time I get an error like this

/usr/include/C++/4.8/bits/basic_string.tcc: 156: 27: error: no corresponding function to call MemoryContextAllocator<char>::MemoryContextAllocator()

It tries to call the allocator constructor with no arguments. If I don't want to introduce this default constructor and use setters, how can I solve this problem?