Error : expected body of lambda expression .. (what is Lambda ???)

Question

Just start learning CS106B , Error messages telling me something wrong with these 3 lines.

" Error : expected body of lambda expression "

string key = aToken.substr([i],1);

myMap.put(aToken.substr([i],1),1);

else {myMap[aToken.substr([i],1)] +=1};

int main() { TokenScanner myTK; myTK.setInput("Sven is Pro Moo Noob <naja>"); myTK.ignoreWhitespace(); Map <string ,int> myMap; while(myTK.hasMoreTokens()){ string aToken = myTK.nextToken(); for(int i=0;i<= int(aToken.size());i++){ string key = aToken.substr([i],1); if(!myMap.containsKey(key)){ myMap.put(aToken.substr([i],1),1); } else {myMap[aToken.substr([i],1)] +=1}; } cout << aToken << endl; } cout<< myMap.toString() << endl; return 0; };

Community · Accepted Answer · 2017-05-23 12:28:47Z

Lambda expression is expression that usually takes form:

[capture list](parameters) {function body}

When compiler notices your [i] it expects that it's beginning of lambda expression. There is no reason to wrap numbers in square brackets in your case.

Lambda expressions allow in-line construction of functor objects with anonymous class. See: What is a lambda expression in C++11?

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