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22.2節の文脈を考慮した修正PR #160

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22.2節の文脈を考慮した修正PR #160

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9545292
文脈に合うようにクラス名を修正
pojiro Aug 15, 2022
6aaf4e6
リファレンスが返り、値を変更可能なことを示すように array の index を修正
pojiro Aug 15, 2022
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15 changes: 8 additions & 7 deletions 022-implement-array.md
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Original file line number Diff line number Diff line change
Expand Up @@ -180,27 +180,28 @@ struct array_int_10
配列はコピーできないが、クラスのデータメンバーとして宣言した配列は、クラスのコピーの際に、その対応する順番の要素がそれぞれコピーされる。

~~~cpp
struct array_int_3 { int storage [3] ; } ;
struct array_int_10 { int storage [10] ; } ;

int main()
{
array_int_3 a = { 0,1,2 } ;
array_int_10 a = {0,1,2,3,4,5,6,7,8,9} ;

array_int_3 b = a ;
array_int_10 b = a ;
// b.storage[0] == a.storage[0]
// b.storage[1] == a.storage[1]
// b.storage[2] == a.storage[2]
// ...
}
~~~

これはあたかも以下のように書いたかのように動く。

~~~cpp
struct array_int_3
struct array_int_10
{
int storage[3] ;
int storage[10] ;

array_int_3( array_int_3 const & other )
array_int_10( array_int_10 const & other )
{
std::copy(
std::begin(other.storage), std::end(other.storage),
Expand Down Expand Up @@ -228,7 +229,7 @@ int main()
{
array_int_10 a = {0,1,2,3,4,5,6,7,8,9} ;
a[3] = 0 ;
std::cout << a[6] ;
std::cout << a[3] ;
}
~~~

Expand Down