empty of

1, why the size of the class is not allowed in C + + is 0Class Zerosizet {}; Zerosizet Z[10];&z[i]-&z[j]; is usually obtained by dividing the number of bytes between two addresses by the type size, while the type size is 0 will be problematic2, why

Transferred from: http://blog.sina.com.cn/s/blog_93b45b0f01015s95.htmlWe often encounter these problems:(1) C + + defines an empty class, what is its size (sizeof)?(2) The size of a class that has only one char data member?(3) Can I define an empty

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...]) Function: Detect whether the variable is set return value: Returns FALSE if the variable does not exist Returns FALSE

By learning the language of PHP, you should know that it is a function-based HTML scripting language. The large library of functions supports the implementation of PHP language functions. Let's introduce the relevant usage of PHP function isset ()

Original: PHP isset () and empty () the use of a different explanationPHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...])Function: Detect whether the variable is setreturn

PHP isset () and empty () the use of a different explanation, Issetempty PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...])Function: Detect whether the variable is

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...]]) Function: Detect whether the variable is set return value: Returns FALSE if the variable does not exist Returns FALSE

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...])Function: Detect whether the variable is setreturn value:Returns FALSE if the variable does not existReturns FALSE if the

empty-checks if a variable is empty Report a bug description BOOL Empty (mixed $var) If Var is a non-null or nonzero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...])Function: Detect whether the variable is setreturn value:Returns FALSE if the variable does not existReturns FALSE if the