关于编译Lambda时报告返回的为void的错误

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

[] (int a, int b){
if (a<b)
return true;
else
return false;
};

[](int a, int b){
return a<b;
};

If a lambda-expression does not include a trailing-return-type, it is as if the trailing-return-type denotes the following type:

If the compound-statement is of the form

{ return expression ; }

the type of the returned expression after lvalue-to-rvalue conversion (4.1), array-to-pointer conversion (4.2), and function-to-pointer conversion (4.3);

otherwise,

void

.