名前空間
変種
操作

operators

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C + +言語
一般的なトピック
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General topics
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フロー制御
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Flow control
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条件付き実行文
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Conditional execution statements
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繰り返し文
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Iteration statements
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文をジャンプします
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Jump statements
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機能します
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Functions
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関数の宣言
ラムダ関数の宣言
関数テンプレート
の歴史。インライン指定
例外仕様 (廃止予定)
noexcept指定子 (C++11)
例外
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Exceptions
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名前空間
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Namespaces
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タイプ
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Types
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decltype specifier (C++11)
指定子
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Specifiers
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CV指定
貯蔵期間指定
constexprの指定子 (C++11)
自動指定 (C++11)
alignas指定子 (C++11)
初期化
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Initialization
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リテラル
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Literals
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Expressions
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代替表現
ユーティリティ
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Utilities
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タイプ
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Types
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typedef declaration
型の別名宣言 (C++11)
属性 (C++11)
キャストします
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Casts
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暗黙の型変換
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Cスタイルキャストと機能
メモリの割り当て
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Memory allocation
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クラス
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Classes
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クラス固有の機能特性
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Class-specific function properties
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明示 (C++11)
静的
特殊なメンバ関数
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Special member functions
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テンプレート
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Templates
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クラステンプレート
関数テンプレート
テンプレートの特殊化
パラメーターパック (C++11)
その他
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Miscellaneous
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インラインアセンブリ
 

目次

[編集] 演算子のオーバーロード

[編集] 構文

type operator op ( params ) ;

[編集] 説明

  • <type>は/変数のタイプ(複数可)ですさ.
    Original:
    <type> is/are the type(s) of the variables.
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  • <op>には、特定の演算子(例えば++=<<>>&&||%など)です.
    Original:
    <op> is the particular operator (e.g. +, +=, <<, >>, &&, ||, %, etc.).
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  • は、<params>は/必要なパラメータ(オペレータに依存します)の名前(s)です.
    Original:
    <params> is/are the name(s) of the required parameters (depends on the operator).
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[編集] 制限

  • あなたは**または&|などの新しい演算子を作成することはできません.
    Original:
    You cannot create new operators such as ** or &|.
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  • すべての演算子はオーバーロードできません
    Original:
    Not all operators can be overloaded
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  • いくつかの演算子は、非静的クラスのメンバとしてオーバーロードすることができます
    Original:
    Some operators can only be overloaded as non-static class members
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  • 短絡評価はオーバーロードされた演算子では動作しません
    Original:
    Short-circuit evaluation doesn't work with overloaded operators
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[編集] オペレータコール

オーバーロードされた演算子は通常の中置記法を使って呼び出すことができます
Original:
Overloaded operators can be called using the usual infix notation
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a+b
や関数のような表記
Original:
or a function-like notation
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operator+(a,b)

[編集]

#include <iostream>
 using namespace std;
 
 class Fraction{
   private:
     int numerator, denominator;
 
   public:
     Fraction(int n, int d): numerator(n), denominator(d) {}
   // Note that the keyword operator combined with an actual
   // operator is used as the function name
   friend ostream& operator<<(ostream&, Fraction&);
 };
 
 ostream& operator<<(ostream& out, Fraction& f){
   out << f.numerator << '/' << f.denominator;
   return out;
 }
 
 int main(){
   Fraction f1(3, 8);
   Fraction f2(1, 2);
 
   cout << f1 << endl;
   cout << 3 << ' ' << f2 << endl;
 
   return 0;
 }

Output:

3/8
3 1/2

[編集] も参照してください

Common operators
代入 incrementNJdecrement 算術 論理 比較 memberNJaccess 他の

a = b
a = rvalue
a += b
a -= b
a *= b
a /= b
a %= b
a &= b
a |= b
a ^= b
a <<= b
a >>= b

++a
--a
a++
a--

+a
-a
a + b
a - b
a * b
a / b
a % b
~a
a & b
a | b
a ^ b
a << b
a >> b

!a
a && b
a || b

a == b
a != b
a < b
a > b
a <= b
a >= b

a[b]
*a
&a
a->b
a.b
a->*b
a.*b

a(...)
a, b
(type) a
? :

Special operators
static_cast別の互換性のあるタイプ
に1型に変換します
Original:
static_cast converts one type to another compatible type
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dynamic_cast派生class
に仮想基底クラスに変換します
Original:
dynamic_cast converts virtual base class to derived class
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const_cast異なるcvqualifiers
と互換性のある型に型変換されます
Original:
const_cast converts type to compatible type with different cv qualifiers
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reinterpret_cast互換性type
に型を変換します
Original:
reinterpret_cast converts type to incompatible type
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new割り当てmemory
Original:
new allocates memory
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delete割り当て解除memory
Original:
delete deallocates memory
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sizeoftype
のサイズを照会します
Original:
sizeof queries the size of a type
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sizeof...パラメーターパック(C++11およびそれ以降)
のサイズを照会します
Original:
sizeof... queries the size of a パラメーターパック (C++11およびそれ以降)
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typeidtype
の型情報を照会します
Original:
typeid queries the type information of a type
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noexcept式が例外(C++11およびそれ以降)
を投げることができるかどうかをチェックします
Original:
noexcept checks if an expression can throw an exception (C++11およびそれ以降)
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alignofタイプ(C++11およびそれ以降)のクエリアラインメント要件を
Original:
alignof queries alignment requirements of a type (C++11およびそれ以降)
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