213ÂÊ: TeXbook¿¡ \expandafterÀÇ ¼³¸íÀº ¾Æ·¡ÀÇ ¼³¸íÀÌ ÀüºÎÀÔ´Ï´Ù. ¿¹Á¦µµ ¾ø½À´Ï´Ù. ÀúÀÚ°¡ ³Ê¹«µµ ¹«½ÉÇÏ°í ¹è·Á°¡ ¾ø½À´Ï´Ù.
- \expandafter<token>. TeX first reads the token that comes immediately after \expandafter, without expanding it; let's call this token t. Then TEX reads the token that comes after t (and possibly more tokens, if that token has an argument), replacing it by its expansion. Finally TeX puts t back in front of that expansion.
´©°¡ ±×·¨´ø°¡¿ä? "¾Æ´Â ¸¸Å¸¸ º¸ÀδÙ"°í. Ã¥ÀÇ Ãʹݺζó°í ÇÒ ¼ö ÀÖ´Â 40ÂÊ¿¡ ³ª¿Â ³»¿ëÀ» Ãʺ¸ÀÚ°¡ ÀÐÀ»¶§¿Í TeXnicianÀÌ ÀÐÀ»¶§¿Í´Â ´Ù¸£°ÚÁÒ. ¿ÀÈ÷·Á ÀúÀڴ ģÀýÇÏ°Ôµµ ³À̵µ¸¦ µÎ¾î Ãʺ¸ÀÚ°¡ ±¦È÷ ÀÐ¾î¼ ÁÂÀýÇϰųª È¥¶õ¿¡ ºüÁö´Â °ÍÀ» »çÀü¿¡ ¿¹¹æÇÏ´Â °Í °°½À´Ï´Ù. Ã¥ ±¸¼ºÀÌ º¼ ¼ö·Ï ¸¶À½¿¡ µì´Ï´Ù. ÇÑ ¹ø ÀÐ°í ¸» Ã¥Àº ºÐ¸íÈ÷ ¾Æ´Õ´Ï´Ù.
À̾߱Ⱑ ´Ù¸¥ °÷À¸·Î ºüÁ³½À´Ï´Ù. ºüÁø ±è¿¡ ¿À´ÃÀº ¿©±â±îÁö.
¸¶À½À» °¡´Ùµë°í ´ÙÀ½¿¡ °°ÀÌ \expandafter¸¦ ÀÌÇØÇØ º¸µµ·Ï ÇսôÙ. TeXbook ÀÌ°÷ Àú°÷¿¡ ³ª¿ÍÀÖ´Â \expandafter ¿¹Á¦¸¦ Àß °øºÎÇÑ ´ÙÀ½¿¡ ºË°Ú½À´Ï´Ù.