Expression Template - Faith and Brave - C++ã§éŠã¼ã†operator+ - * / ã®ã‚ˆã†ãªæ¼”ç®—åã®ä¸€èˆ¬çš„ãªå®Ÿè£…ã§ã¯ä¸€æ™‚オブジェクトã®ã‚³ã‚¹ãƒˆãŒç™ºç”Ÿã—ã¾ã™ã€‚ Vector operator+(const Vector& l, const Vector& r) { const std::size_t n = l.size(); Vector tmp(l); for (std::size_t i = 0; i < n; ++i) tmp[i] += r[i]; return tmp; } ãã®ãŸã‚ã€ä»¥ä¸‹ã®ã‚ˆã†ãªå¼ã‚’書ã„ãŸå ´åˆ Vector x, y, z, t; t = x + y + z; x + y + z ã§ã¯ 2 ã¤ã®ä¸€æ™‚オブジェクトãŒç”Ÿæˆã•ã‚Œã¦ã—ã¾ã†ã®ã§ã™ã€‚ 以下ã®ã‚ˆã†ã«æ›¸ã‘ã°ä¸€æ™‚オブジェクトã¯ç”Ÿæˆã•ã‚Œã¾ã›ã‚“㌠const std::size_t n = x.size(); for (std::size_t i = 0; i < n;
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