LANG.LAMBDA.MRT : Lambda Has No Return Type

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A lambda expression has non-void return type, but the return type is not explicitly specified.

Class Name

Lambda Has No Return Type

Significance

style

Mnemonic

LANG.LAMBDA.MRT

Categories

AUTOSARC++14	AUTOSARC++14:A5-1-6	Return type of a non-void return type lambda expression should be explicitly specified.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Lambda Has No Return Type"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

int lambda_returntype(int i){
   int rv = 0;
  
   auto lambda_void = [&rv](int x){                          // ok: void return type
                        rv += x;
                      };

   auto lambda_nortype = [](int x){   // 'Lambda Has No Return Type' warning issued here
                           return x+5;
                         };

   auto lambda_rtype =  [](int x)->int{                      // ok: return type explicitly specified
                        return x+6;
                      };

   lambda_void(i);
   return rv + lambda_nortype(i) + lambda_rtype(i);
}

The following configuration file parameters affect checks for this warning class.

LANG.LAMBDA.MRT : Lambda Has No Return Type

Summary

Properties

Example

Relevant Configuration File Parameters