null pointer valueとは 意味・読み方・使い方

function returns a pointer to the value in the environment, or NULL if there is no match.発音を聞く 例文帳に追加

は、環境における値 value へのポインタを返す。 - JM

Description If XtGetActionKeysym is called after an action procedure has been invoked by the Intrinsics and before that action procedure returns, and if the event pointer has the same value as the event pointer passed to that action routine, and if the event is a KeyPress or KeyRelease event, then XtGetActionKeysym returns the KeySym that matched the final event specification in the translation table and, if/fImodifiers_return/fP is non-NULL, the modifier state actually used to generate this KeySym; otherwise, if the event is a KeyPress or KeyRelease event, then XtGetActionKeysym calls XtTranslateKeycode and returns the results; else it returns NoSymbol and does not examine modifiers_return.例文帳に追加

そうでない場合、イベントがKeyPressイベントまたはKeyReleaseイベントならば、XtGetActionKeysym はXtTranslateKeycodeを呼び出し、その結果を返す。 - XFree86

An important convention throughout the Python interpreter is the following: when a function fails, it should set an exception condition and return an error value (usually a NULL pointer).例文帳に追加

Python インタプリタ全体を通して、一つの重要な取り決めがあります:それは、関数が処理に失敗した場合、例外状態をセットして、エラーを示す値 (通常は NULL ポインタ) を返さねばならない、ということです。 - Python