函数typename BaseClass<PointT>::Parameter x;
为<div id="responsive-form" class="clearfix">
<div class="vc_row ">
<div class="vc_col-sm-6">
<label> Your Name (required)
[text* your-name] </label>
</div>
<div class="vc_col-sm-6">
<label> Your Email (required)
[email* your-email] </label>
</div>
</div>
<label> Arrival date
[date date-79 id:Arrivaldate date-format:mm/dd/yy] </label>
<label> Departure date
[date date-80 id:Departuredate date-format:mm/dd/yy] </label>
<label> How many guests?
[text your-guests] </label>
<div class="form-row">
<p>Number of adults [text your-adults]</p>
<p>Number of children under 6 years old [text your-little-children]</p>
<p>Number of children under 12 years old [text your-big-children]</p>
</div>
Select your preferred accomodation
[checkbox your-accomodation use_label_element "Wayan (Two-story villa)" "Kadek (Two-story villa)" "Nyoman (Garden bungalow)" "Kehut (Garden bungalow)" "Pasca (Garden bungalow)"]
Do you need transportation to the hotel ?
[radio your-pickup default:1 use_label_element exclusive "No transport needed" "Transport from Denpasar airport" "Transsport from Gilimanuk Ferry"]
<label> Do you want us to arrange motorbike rental for you ?
[text your-motorbikes] </label>
<label> Tell us more about what brings you to Balian
[textarea your-message] </label>
[submit "Send"]
</div>为A => A，组成为identity。不幸的是我没有在empty库中找到它。库是否为这些函数提供了monoid实例？
combine怎么样，cats是monad还是appative？
答案 0 :(得分：2)
Cats在instances/function.scala中有一个A => A的Monoid实例。
A => M[A]要求Monad M接缝形成一个Monoid，a => M.pure(a)为empty以下combine op：
def compose(f1 = A => M[A], f2 = A => M[A]): A => M[A] =
a => f1(a).flatMap { e => f2(e) }
这不是在图书馆中实施的 Monoid法则的证明留给了读者。