操作符 Delete
删除使用New操作符赋值的数据
Delete buf
Delete用于销毁和释放使用New创建的对象的内存。删除TYPE时，它的析构函数将被调用。Delete只能与New返回的地址一起使用。
阵列版本DeleteDelete[]用于销毁先前使用New[]创建的对象数组。破坏者也将在这里被称为。
Delete必须与New和Delete[]New[]返回的地址一起使用。您不能混合和匹配不同版本的运算符。
内存被删除后，buf 指针将指向无效内存。在同一个指针值上调用Delete两次导致未定义的行为。设置buf pointer to null (0), 为了防止后来的代码使用它意外，因为空指针解引用更容易找到和调试。
在空指针上调用 删除 不会导致任何操作。
语法
用法
Delete buf
or
Delete[] buf 参数
说明
Delete用于销毁和释放使用New创建的对象的内存。删除TYPE时，它的析构函数将被调用。Delete只能与New返回的地址一起使用。
阵列版本DeleteDelete[]用于销毁先前使用New[]创建的对象数组。破坏者也将在这里被称为。
Delete必须与New和Delete[]New[]返回的地址一起使用。您不能混合和匹配不同版本的运算符。
内存被删除后，buf 指针将指向无效内存。在同一个指针值上调用Delete两次导致未定义的行为。设置buf pointer to null (0), 为了防止后来的代码使用它意外，因为空指针解引用更容易找到和调试。
在空指针上调用 删除 不会导致任何操作。
例子
Type Rational
As Integer numerator, denominator
End Type
' Create and initialize a Rational, and store its address.
Dim p As Rational Ptr = New Rational(3, 4)
Print p->numerator & "/" & p->denominator
' Destroy the rational and give its memory back to the system.
Delete p
' Set the pointer to null to guard against future accesses
p = 0
As Integer numerator, denominator
End Type
' Create and initialize a Rational, and store its address.
Dim p As Rational Ptr = New Rational(3, 4)
Print p->numerator & "/" & p->denominator
' Destroy the rational and give its memory back to the system.
Delete p
' Set the pointer to null to guard against future accesses
p = 0
' Allocate memory for 100 integers, store the address of the first one.
Dim p As Integer Ptr = New Integer[100]
' Assign some values to the integers in the array.
For i As Integer = 0 To 99
p[i] = i
Next
' Free the entire integer array.
Delete[] p
' Set the pointer to null to guard against future accesses
p = 0
Dim p As Integer Ptr = New Integer[100]
' Assign some values to the integers in the array.
For i As Integer = 0 To 99
p[i] = i
Next
' Free the entire integer array.
Delete[] p
' Set the pointer to null to guard against future accesses
p = 0
方言差异
- Only available in the -lang fb 方言可能是个好主意。
与QB差别
- 新的FreeBASIC
参考