{"id":3651,"date":"2012-08-17T10:27:36","date_gmt":"2012-08-17T01:27:36","guid":{"rendered":"http:\/\/www.moonmile.net\/blog\/archives\/3651"},"modified":"2012-08-17T10:47:10","modified_gmt":"2012-08-17T01:47:10","slug":"c-bool%e5%80%a4%e3%82%92%e3%82%a4%e3%83%b3%e3%82%af%e3%83%aa%e3%83%a1%e3%83%b3%e3%83%88%e3%81%99%e3%82%8b%e3%81%a8%e3%80%81turefalse-%e3%82%92%e7%b9%b0%e3%82%8a%e8%bf%94%e3%81%99%e7%90%86","status":"publish","type":"post","link":"http:\/\/www.moonmile.net\/blog\/archives\/3651","title":{"rendered":"[C++] bool\u5024\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u3068\u3001ture\/false \u3092\u7e70\u308a\u8fd4\u3059\u7406\u7531…\u3092\u3053\u3058\u3064\u3051\u308b"},"content":{"rendered":"

bool\u5024\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u2026\u2026\uff1f – Togetter
\nhttp:\/\/togetter.com\/li\/356718<\/a>
\nc++ – bool operator ++ and — – Stack Overflow
\nhttp:\/\/stackoverflow.com\/questions\/3450420\/bool-operator-and<\/a><\/p>\n

3.2 Increment and decrement [expr.pre.incr]
\n1 The operand of prefix ++ is modified by adding 1, or set to true if it is bool (this use is deprecated).
\nThe operand shall be a modifiable lvalue. The type of the operand shall be an arithmetic type or a pointer
\nto a completely-defined object type. The value is the new value of the operand; it is an lvalue. If x is not
\nof type bool, the expression ++x is equivalent to x+=1. [Note: see the discussions of addition (5.7) and
\nassignment operators (5.17) for information on conversions. ]<\/p><\/blockquote>\n

\u3092\u898b\u3066\u300c\u3048\u30fc\u30c3!!! \u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308c\u3070 true\/false \u3092\u7e70\u308a\u8fd4\u3059\u307b\u3046\u304c\u5bfe\u79f0\u6027\u304c\u9ad8\u3044\u3057\u3001\u4ed6\u3068\u306e\u4e92\u63db\u6027\u3082\u9ad8\u3044\u30c3!!! \u5f53\u7136\u306e\u898f\u7d04\u3060\u308d\u3046\u3002\u6614 bool \u578b\u304c int \u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u305f\u306e\u306f\u30de\u30b7\u30f3\u306e\u5236\u7d04\u306b\u95a2\u308f\u308b\u90e8\u5206\u304c\u591a\u304f\u3066\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u7684\u306b\u306f\u3001true\/false \u304c\u4ea4\u4e92\u306b\u306a\u308b\u307b\u3046\u304c\u3088\u3044\u300d\u3068\u3044\u3046\u306e\u3092\u3074\u304d\u30fc\u3093\u3068\u8003\u3048\u305f\u306e\u3067\u3059\u304c…\u30bf\u30a4\u30c8\u30eb\u3092\u898b\u3066\u5206\u304b\u308b\u3088\u3046\u306b\u300c\u3053\u3058\u3064\u3051\u300d\u3067\u3059\u3002<\/p>\n

\u5b9f\u306f\u624b\u5143\u306b\u3042\u308b VC++2010, VC++2012, G++4.5.2 \u3067\u8a66\u3057\u305f\u3068\u3053\u308d\u3001bool \u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u3068 true(1) -> ture(1) \u306a\u3093\u3067\u3059\u308f\u30fc\u3001\u3068\u3044\u3046\u308f\u3051\u3067\u300c\u975e\u63a8\u5968\u300d\u3067\u3059\u306d\u3001\u3064\u30fc\u304b\u3001\u51e6\u7406\u7cfb\u306b\u4f9d\u5b58\u3059\u308b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3061\u3083\u30c0\u30e1\u3067\u3059\u306d\u3002<\/p>\n

\u25a0\u5b9f\u9a13\u30b3\u30fc\u30c9\u3092\u4f5c\u308b<\/p>\n

\r\nint main( void )\r\n{\r\n\tbool b = false;\r\n\r\n\t\/\/ \u5f8c\u7f6e\u578b\r\n\tcout << &quot;bool: &quot; << b++ << endl;\t\/\/ false\r\n\tcout << &quot;bool: &quot; << b++ << endl;\t\/\/ true\r\n\tcout << &quot;bool: &quot; << b   << endl;\t\/\/ false\r\n\tcout << endl;\r\n\r\n\tb = false;\r\n\t\/\/ \u524d\u7f6e\u578b\r\n\tcout << &quot;bool: &quot; << ++b << endl;\t\/\/ true\r\n\tcout << &quot;bool: &quot; << ++b << endl;\t\/\/ false\r\n\tcout << &quot;bool: &quot; << b   << endl;\t\/\/ true\r\n\tcout << endl;\r\n\r\n\tb = false;\r\n\tfor ( int i=0; i<5; i++ ) {\r\n\t\tcout << b << endl;\r\n\t\tb = !b ;\t\/\/ \u53cd\u8ee2\r\n\t}\r\n\tcout << endl;\r\n\t\/\/ \u5229\u70b9\u3068\u3057\u3066\u306f\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3092\u4f7f\u3046\u30681\u884c\u3067\u66f8\u3051\u308b\r\n\tb = false;\r\n\tfor ( int i=0; i<5; i++ ) {\r\n\t\tcout << b++ << endl;\t\/\/ \u5f8c\u3067\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\r\n\t}\r\n\tcout << endl;\r\n\r\n\treturn 0;\r\n}\r\n<\/pre>\n
\u671f\u5f85\u3059\u308b\u3068\u3053\u308d\u306f\u3001\u30b3\u30e1\u30f3\u30c8\u306b\u3042\u308b\u901a\u308a true\/false \u3092\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002
\n\u671f\u5f85\u901a\u308a\u306b\u52d5\u304f\u306e\u3067\u3042\u308c\u3070\u3001\u300c!b\u300d\u3067\u53cd\u8ee2\u3055\u305b\u308b\u3088\u308a\u3082\u3001b++ \u306b\u3059\u308b\u30681\u884c\u3067\u6e08\u3080\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
bool \u5024\u306f\u3001\u4e00\u898b\u300c\u8ad6\u7406\u5f0f\u300d\u306e\u305f\u3081\u306b\u7528\u610f\u3055\u308c\u3066\u3044\u308b on\/off \u306e\u72b6\u614b\u3092\u793a\u3059\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u3002\u53cd\u8ee2\u3092\u8868\u3059\u300c!\u300d\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5834\u5408 on <-> off \u306e\u4ea4\u4e92\u306b\u306a\u308b\u3001\u3064\u307e\u308a\u306f\u3001<\/p>\n