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構造化束縛before-afrer

Posted at

構造化束縛における適用前、適用後

C++17において、構造化束縛が追加されました。
とても便利な機能なので是非利用したい。
私としては、忘備録として、この記事を書く。

before

auto human_bind(){
    struct human{std::string name_; int years_; bool ok_;}
    return human{"elen",21,true};
}

auto a = human();
   std::cout<<a.name_<<","<<a.years_<<","<<a.ok_<<std::endl;

after

#include<iostream>
#include <tuple>

int main(){
   auto human = {
       std::make_tuple("elen",21,true),
       std::make_tuple("eva",1,false)
   };

   for(auto&& [name,years,ok]:human){
      std::cout<<name<<","<<years<<","<<ok<<std::endl;
   }
}

elen,21,1
eva,1,0

以上

C++20待ち遠しい・・・。。

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