CODEWITHSUNDEEP
c++c++11
rontgen
rontgen

Reputation: 81

use reference in std::map

I want to use reference in std::map

typedef const std::function<void(const cocos2d::Ref*)>& callBack;

std::map<const std::string&, callBack> m_mapListener

and my error message is:

error C2535: 'const std::function<void (const cocos2d::Ref *)> &std::map<const std::string &,callBack,
std::less<_Kty>,std::allocator<std::pair<_Kty,_Ty>>>::operator [](const std::basic_string
<char,std::char_traits<char>,std::allocator<char>> &)' : 
member function already defined or declared 
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include\map

How could I fix it?

Upvotes: 0

Views: 236

Answers (1)

Dimitrios Bouzas
Dimitrios Bouzas

Reputation: 42899

Define your map as:

std::map<std::string, callBack> m_mapListener;

STL containers don't support references because they require that their element type meets the requirements of Erasable, in which case references don't.

Upvotes: 3

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