dougongyou7364 2014-10-21 10:14
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在golang中,ec2.CreateSecurityGroup中的名称类型是什么

I am using CreateSecurityGroup func in golang using goamz. Below is the function signature:

func (ec2 *EC2) CreateSecurityGroup(name, description string) (resp *CreateSecurityGroupResp, err error)

What type does the argument name have in this argument list?

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  • dongnang8192 2014-10-21 10:41
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    The spec for function of method signature allows for parameters to use an IdentifierList for one type:

    ParameterDecl  = [ IdentifierList ] [ "..." ] Type .
    
    • name, description is the identifier list.
    • string is the type which applies to that list.

    You have the same feature for variable declaration:

    var U, V, W float64
    

    All three variables have the same type float64.


    Note: a more recent version of the goamz source code shows that same method with a different parameter: see commit 04a8dd3

    func (ec2 *EC2) CreateSecurityGroup(group SecurityGroup)
      (resp *CreateSecurityGroupResp, err error) {...
    

    with:

    type SecurityGroup struct {
        Id string `xml:"groupId"`   + Id string `xml:"groupId"`
        Name string `xml:"groupName"`   + Name string `xml:"groupName"`
        Description string `xml:"groupDescription"`
        VpcId string `xml:"vpcId"`
    }
    

    This is typical when the number of potential parameters grows: you wrap them in a struct.

    It is used in this test:

    resp, err := 
      s.ec2.CreateSecurityGroup(ec2.SecurityGroup{Name: "websrv", 
                                                  Description: "Web Servers"})
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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