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Microsoft C++ Error C3499

Symptoms

error C3499: a lambda that has been specified to have a void return type cannot return a value

Cause

Visual Studio 2010 does not fully support the C++ syntax BullseyeCoverage uses for instrumenting lambda expressions.

Resolution

Use one of the following alternatives.

• Use Visual Studio 2012 or later.
• Add the return type to the lamdba expression. For example:

  [](T n) { return n; }      // C3499 with BullseyeCoverage
  [](T n) -> T { return n; } // OK
  

• Exclude the lambda-expression.

Updated: 21 Mar 2017

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