Compiler Error C3493

'var' cannot be implicitly captured because no default capture mode has been specified

The empty lambda expression capture, [], specifies that the lambda expression does not explicitly or implicitly capture any variables.

To correct this error

• Provide a default capture mode, or

• Explicitly capture one or more variables.

Examples

The following example generates C3493 because it modifies an external variable but specifies the empty capture clause:

// C3493a.cpp

int main()
{
   int m = 55;
   [](int n) { m = n; }(99); // C3493
}

The following example resolves C3493 by specifying by-reference as the default capture mode.

// C3493b.cpp

int main()
{
   int m = 55;
   [&](int n) { m = n; }(99);
}

See also

Lambda Expressions