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028 constexpr if: ソースコードにtypoがある? #82

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nekketsuuu opened this issue Oct 12, 2017 · 0 comments · Fixed by #115
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028 constexpr if: ソースコードにtypoがある? #82

nekketsuuu opened this issue Oct 12, 2017 · 0 comments · Fixed by #115

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@nekketsuuu
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nekketsuuu commented Oct 12, 2017 •
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028 constexpr if の「constexpr ifでは解決できない問題」にあるソースコードは「実行時の条件分岐」にあるソースコードと全く一緒です。constexpr の入れ忘れではないでしょうか。つまり、以下のようなコードなのではないでしょうか。

// do_true_thingの宣言
void do_true_thing() ;

// do_false_thingの宣言は存在しない

void f( bool runtime_value )
{
    if constexpr ( true )
        do_true_thing() ;
    else
        do_false_thing() ; // エラー
}

上記コードの Wandbox
@nekketsuuu nekketsuuu changed the title 028: ソースコードにtypoがある? 028 constexpr if: ソースコードにtypoがある? Oct 12, 2017
@nekketsuuu nekketsuuu mentioned this issue Oct 16, 2017
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fix (constexpr if): insert constexpr nekketsuuu/cpp17book
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