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Pointer that points to a function
A function pointer, also called a subroutine pointer or procedure pointer, is a pointer referencing executable code, rather than data. Dereferencing the
Function_pointer
Object which stores memory addresses in a computer program
Bounded pointer Buffer overflow Cray pointer Fat pointer Function pointer Hazard pointer Indirection Iterator Opaque pointer Pointee Pointer swizzling
Pointer (computer programming)
Pointer_(computer_programming)
Mechanism for supporting dynamic dispatch
virtual function (or method), most compilers add a hidden member variable to the class that points to an array of pointers to (virtual) functions called
Virtual_method_table
Data types supported by the C programming language
nullptr) to express a null pointer constant. nullptr is unambiguously a pointer, and may convert to any object or function pointer, and allows a specific
C_data_types
Technique for creating lexically scoped first class functions
provide a pointer to a method with a similar syntax to a function pointer. Standard C allows writing a typedef for a pointer to a function type using
Closure (computer programming)
Closure_(computer_programming)
Type qualifier denoting the data as being read-only
addition, a (non-static) member-function can be declared as const. In this case, the this pointer inside such a function is of type const T* rather than
Const_(computer_programming)
Mechanism by which a computer program can load a library (or other binary) into memory
result of dlsym() is a void pointer. However, a function pointer is not required to even have the same size as a data object pointer, and therefore a valid
Dynamic_loading
Pointer that does not point to a valid object
Dangling pointers and wild pointers in computer programming are pointers that do not point to a valid object of the appropriate type. These are special
Dangling_pointer
General-purpose programming language
memory via pointers Supports procedure-like construct as a function returning void Supports dynamic memory via standard library functions Includes the
C_(programming_language)
Form of text that defines C code
advanced use of pointers – passing a pointer to a pointer. An int pointer named a is defined on line 9 and its address is passed to the function on line 10
C_syntax
Data structure used in computer programs
pointer. At function return, the stack pointer is instead restored to the frame pointer, the value of the stack pointer just before the function was called
Call_stack
Keyword in programming languages
a pointer to a function that returns an integer and takes as arguments a float followed by an integer. When a function returns a function pointer, it
Typedef
Programming construct
of a function object is in writing callback functions. A callback in procedural languages, such as C, may be performed by using function pointers. However
Function_object
Function that takes one or more functions as an input or that outputs a function
return 0; } The qsort function from the C standard library uses a function pointer to emulate the behavior of a higher-order function. Macros can also be
Higher-order_function
Anomaly in computer security and programming
the shellcode. Once the function returns, execution will resume at the attacker's shellcode; By overwriting a function pointer or exception handler to
Buffer_overflow
Return type for functions that do not output values when called
void in memory. A program can convert a pointer to any type of data (except a function pointer) to a pointer to void and back to the original type without
Void_type
Data type simulating a pointer with additional features
In computer science, a smart pointer is an abstract data type that simulates a pointer while providing added features, such as automatic memory management
Smart_pointer
Programming language feature
3, 4, 5] If functions are represented with bare function pointers, we can not know anymore how the value that is outside of the function's body should
First-class_function
Computer exploit using just-in-time compilation
overflow or use after free bug could allow the attack to modify a function pointer or return address. This causes the CPU to execute instructions in a
JIT_spraying
Table specifying actions based on conditions
be a lookup table containing a range of possible input values and a function pointer to the section of code to process that input. Multiple conditions can
Decision_table
Computer science process
called a virtual function table (vtable) that defines the name-to-implementation mapping for a given class as a set of member function pointers. This is purely
Dynamic_dispatch
Extension to the C programming language
manner as a function pointer. The block may be assigned to variables, passed to functions, and otherwise treated like a normal function pointer, although
Blocks_(C_language_extension)
Coding guidelines by Gerald J. Holzmann
not be hidden in macro definitions or inside typedef declarations. Function pointers are not permitted. All code must be compiled, from the first day of
The Power of 10: Rules for Developing Safety-Critical Code
The_Power_of_10:_Rules_for_Developing_Safety-Critical_Code
Software design pattern
This can be achieved by mechanisms such as the native function pointer, the first-class function, classes or class instances in object-oriented programming
Strategy_pattern
Dynamic memory management in the C programming language
the library function malloc is used to allocate a block of memory on the heap. The program accesses this block of memory via a pointer that malloc returns
C_dynamic_memory_allocation
Function reference passed to and called by another function
Pascal, Modula-2 and other languages, a callback function is stored internally as a function pointer. Using the same storage allows different languages
Callback (computer programming)
Callback_(computer_programming)
Foreign function interface for the Java language
declaration of a pointer to identify the specific function; (JNIEnv *env); // Parameter env is a pointer to the JNIEnv pointer, the pointer-to-pointer; jclass
Java_Native_Interface
Software anomaly
metadata) and uses the resulting pointer exchange to overwrite a program function pointer. For example, on older versions of Linux, two buffers allocated next
Heap_overflow
demonstrates this: // No captures, the lambda is implicitly convertible to a function pointer. auto a = [] -> void {}; // x is captured by value and y is captured
Examples of anonymous functions
Examples_of_anonymous_functions
American family R&B vocal group
The Pointer Sisters are an American female vocal group from Oakland, California, who achieved mainstream success during the 1970s and 1980s. They have
The_Pointer_Sisters
Computer security exploit technique
top of the stack, and sets the instruction pointer to that value, and secondly, it increases the stack pointer value by four (equivalent to a pop operation)
Return-oriented_programming
Mathematical-logic system based on functions
mechanism of function pointers. However, function pointers are an insufficient condition for functions to be first class datatypes, because a function is a first
Lambda_calculus
Concept in assembly language programming
if the architecture has a base pointer (also known as frame pointer) and a stack pointer: Pushes current base pointer onto the stack, so it can be restored
Function prologue and epilogue
Function_prologue_and_epilogue
Cyber attack where any code can be run
copy of Super Mario World by utilizing an out-of-bounds read of a function pointer that points to a user controlled buffer to execute arbitrary code.
Arbitrary_code_execution
Data table used to control program flow
varies. Some languages provide a direct function reference (i.e. pointer) that can be used to invoke a function directly, but some languages do not. Some
Control_table
Method of transferring program control to another part of a program
method table" but essentially performing exactly the same purpose. This pointer function method can result in saving one machine instruction, and avoids the
Branch_table
Topics referred to by the same term
programming languages **, a pointer to a pointer (or double pointer) in C syntax **, interpolation of keyword arguments into function calls in Python **, symbol
**
Standard library function in the C programming language
kinds of data (polymorphism) is achieved by taking a function pointer to a three-way comparison function, as well as a parameter that specifies the size of
Qsort
Hall. ISBN 978-0-13-604259-4.. The function may be stored as a reference to a function, such as a function pointer. In this article, the term "subroutine"
Glossary_of_computer_science
2011 edition of the C++ programming language standard
std::unique_ptr. Function object base classes (std::unary_function, std::binary_function), adapters to pointers to functions and adapters to pointers to members
C++11
Comparison of programming languages
that uses function pointers. Some compilers will produce non-working code if a function pointer declared extern "C" points to a C++ function that is not
Compatibility_of_C_and_C++
Class of computer memory address reference
In computer science, a tagged pointer is a pointer (concretely a memory address) with additional data associated with it, such as an indirection bit or
Tagged_pointer
Programming technique using indirect jumps
function. The function pointer is then simply the address of the trampoline. This avoids having to use "fat" function pointers for nested functions which
Trampoline_(computing)
Concept in programming language design
still be manipulated in most of the above fashions (via function pointers). In Smalltalk, functions (methods) are first-class objects, just like Smalltalk
First-class_citizen
Calling conventions used in x86 architecture programming
leaf-node functions (functions which do not call any other function(s)), a 128-byte space is stored just beneath the stack pointer of the function. The space
X86_calling_conventions
Family of higher-order functions
In functional programming, a fold is a higher-order function that analyzes a recursive data structure and, through use of a given combining operation,
Fold_(higher-order_function)
Programming language
directly. These extensions included null-terminated strings, pointer arithmetic, function pointers, an address-of operator, and unsafe typecasts. Turbo Pascal
Pascal_(programming_language)
Technique in computer security
control the flow of execution when the code uses that address as a function pointer and redirects it to the sprayed heap. If the exploit succeeds in redirecting
Heap_spraying
Opaque data type which stores a memory address
computer programming, an opaque pointer is a special case of an opaque data type, a data type declared to be a pointer to a record or data structure of
Opaque_pointer
Type of computer science algorithm
constant amount of extra space, counting everything including function calls and pointers. However, this form is very limited as simply having an index
In-place_algorithm
Computer code structure with a table of pointers to functions or similar
In computer science, a dispatch table is a table of pointers or memory addresses to functions or methods. Use of such a table is a common technique when
Dispatch_table
Sharable executable library in Windows and OS/2
printf("ERROR: unable to load DLL\n"); return 1; } // Get function pointer addNumbers = (ImportedFunction) GetProcAddress(hinstLib, "AddNumbers"); if (!addNumbers)
Dynamic-link_library
General-purpose programming language
2019. Retrieved April 14, 2019. BillWagner. "Unsafe code, pointers to data, and function pointers". Microsoft Learn. Archived from the original on July 4
C Sharp (programming language)
C_Sharp_(programming_language)
that can be called like a function. pointer to function; pointer to member function; functor; lambda expression. std::function is a template class that
Callable_object
Feature of some programming languages
object. Dynamic dispatch can be done by looking up this value in a function pointer branch table. Here is a simple example in C: typedef void (*CollisionCase)(void);
Multiple_dispatch
Techniques to alter a program
hidden VMT pointer at the first 4 bytes of every instance of the class. A VMT is basically an array of pointers to all the virtual functions that instances
Hooking
Defines the inputs and outputs for a function, subroutine or method
is commonly known as a function prototype. In C/C++, a function declaration reflects its use; for example, a function pointer with the signature (int)(char
Type_signature
Language construct in Qt framework
received by other objects using special member functions known as slots. This is similar to C/C++ function pointers, but the signal/slot system ensures the type-correctness
Signals_and_slots
Inheritable and overridable function or method for which dynamic dispatch is facilitated
such a reference or pointer can be bound (linked) either "early" (by the compiler), according to the declared type of the pointer or reference, or "late"
Virtual_function
Source code that alters its instructions to the hardware while executing
modifying function pointers, as in this JavaScript example: var f = function (x) {return x + 1}; // assign a new definition to f: f = new Function('x', 'return
Self-modifying_code
Keyword in C (programming language)
that there is only one pointer to a memory block, it can produce better optimized code. For instance, in a function updatePointers() which adds a value
Restrict
Datatype in C++
to function, function-to-pointer conversion does not take place (see fnRef above), but it does take place when initializing a reference to function pointer:
Reference_(C++)
Indicator showing where text would be input
display device that will respond to input, such as a text cursor or a mouse pointer. Cursor is Latin for 'runner'. A cursor is a name given to the transparent
Cursor_(user_interface)
Term in computer security
function using the stack – an indirect backward-edge transfer. When a function pointer is called, such as from a virtual table, we say there is an indirect
Control-flow_integrity
Free Unix-like operating system kernel
December 2020. Desaulniers, Nick (19 November 2020). "Re: violating function pointer signature". LKML. Archived from the original on 14 April 2021. Retrieved
Linux_kernel
Software security techniques
from being altered by clobbered pointers, they do not protect any other data or the pointers themselves. Function pointers especially are a problem here
Buffer_overflow_protection
C-like programming language
C while omitting or changing standard C features such as variadic functions, pointer syntax, and aspects of C's type system, because they are considered
C--
COM-based Visual Basic scripting language
and ExecuteGlobal functions to evaluate and execute script commands built during the execution of another script; a function-pointer system via GetRef
VBScript
Dog breed
[ˈviʒlɒ]), also known as Hungarian Vizsla, Magyar Vizsla or Hungarian Pointer, is a dog breed from Hungary and belongs to the Fédération Cynologique
Vizsla
Instruction set architecture
the stack pointer, although this may be optional. For the N32 and N64 ABIs, a function must preserve the $s0-$s7 registers, the global pointer ($gp or $28)
MIPS_architecture
Intermediate representation defined within the CLI specification
and return Throwing exceptions Monitor-based concurrency Data and function pointers manipulation needed for C++/CLI and unsafe C# code The Common Intermediate
Common_Intermediate_Language
Topics referred to by the same term
functor logic Function word in linguistics In computer programming: Functor (functional programming) Function object used to pass function pointers along with
Functor_(disambiguation)
Programming statement for branching control based on a value
value encodes what is otherwise in the case section – as a function pointer or anonymous function or similar mechanism. In a language that does not provide
Switch_statement
Extent to which a programming language discourages type errors
memory allocation function, such as malloc, with an argument indicating how many bytes are required. The function returns a void pointer (void*), which the
Type_safety
would be an interface pointer, that is, a pointer to a pointer to a virtual method table (which is an array of function pointers). The Collection class
Variant_type_(COM)
A delegate is a form of type-safe function pointer used by the Common Language Infrastructure (CLI). Delegates specify a method to call and optionally
Delegate_(CLI)
MacOS framework
objects as function pointer arguments. It will then use the libffi library to dynamically create a closure and pass it to the underlying function/method.
RubyCocoa
Attribute of data
Bool denoting functions taking an integer and returning a Boolean. In C, a function is not a first-class data type but function pointers can be manipulated
Data_type
Ancient Greek analogue astronomical computer
functions of the pointers were deduced from the remains of the dials on the back face, and reasonable, appropriate gearage to fulfill the functions was
Antikythera_mechanism
Mechanism of function calls in computers
full-descending stack. In addition, the stack pointer must always be 4-byte aligned, and must always be 8-byte aligned at a function call with a public interface. This
Calling_convention
Comparison of two programming languages
simulated using pointers. The following segment is similar to the Pascal segment above: // function accepts an int (by value) and a pointer to int (also
Comparison_of_Pascal_and_C
Function that loads and executes a new child process
argument after argn has to be a null pointer. The argv argument is an array of character pointers. The last pointer in the array must be null to indicate
Spawn_(computing)
1995 edition of the Fortran programming language standard
keyword arguments; POINTER and TARGET arguments (see Pointers); POINTER function result; new-style array arguments and array functions (Array handling)
Fortran_95_language_features
operator->() must be a type for which the -> operation can be applied, such as a pointer type. If x is of type C where C overloads operator->(), x->y gets expanded
Operators_in_C_and_C++
Abstract machine used as a target for compilers
front of that, clearing the stack, and setting C to the closure's function pointer. The previous values of S, E, and the next value of C are saved on
SECD_machine
Function for sorting in C++ standard library
void pointers, as qsort does. Also, qsort accesses the comparison function using a function pointer, necessitating large numbers of repeated function calls
Sort_(C++)
C keyword for defining a structured data type
c occupies 4 bits }; Pointers can be used to refer to a struct by its address. This is useful for passing a struct to a function to avoid the overhead
Struct (C programming language)
Struct_(C_programming_language)
Universal type in logic and computer science
for an object at runtime. In C and C++, the void pointer type (void*) can accept any non-function pointer, even though the void type is not the universal
Any_type
Related programming concepts of responsibility for actions
their credentials or permissions. Delegate (CLI), a form of type-safe function pointer used by the Common Language Infrastructure (CLI), specifying both a
Delegation_(computing)
Computer fault caused by access to restricted memory
uninitialized pointer (wild pointer, which points to a random memory address) Dereferencing or assigning to a freed pointer (dangling pointer, which points to memory
Segmentation_fault
variance Virtual class Virtual function (also called virtual method) Virtual function pointer (also called virtual method pointer) Virtual inheritance (Object
Index of object-oriented programming articles
Index_of_object-oriented_programming_articles
Document that proposed additions to the C++ standard library
file: Polymorphic function wrapper (function) – can store any callable function (function pointers, member function pointers, and function objects) that uses
C++_Technical_Report_1
Multi-paradigm system programming language
literals, function, which is simply a pointer to a stack-allocated function, and delegate, which also includes a pointer to the relevant stack frame, the surrounding
D_(programming_language)
Set of rules defining correctly structured programs for the C# programming language
closure-like functions. C# supports various ways to create anonymous methods. This is a feature of C# 2.0. Anonymous delegates are function pointers that hold
C_Sharp_syntax
Programming language implementation problem
This λ function carries the functions f and g (or pointers to them) as internal state. The problem in this case exists if the compose function allocates
Funarg_problem
Comparison between two programming languages
deprecated and not recommended. In C++, pointers can point to functions or member functions (function pointers). The equivalent mechanism in Java uses
Comparison_of_Java_and_C++
Abstract data type
stack may be implemented as, for example, a singly linked list with a pointer to the top element. A stack may be implemented to have a bounded capacity
Stack_(abstract_data_type)
Mapping arbitrary data to fixed-size values
table holding the data or records, or pointers to them. A hash function may be considered to perform three functions: Convert variable-length keys into fixed-length
Hash_function
Input/output functionality in the C programming language
header include: FILE – also known as a file handle or a FILE pointer, this is an opaque pointer containing the information about a file or text stream needed
C_file_input/output
Type of program control instruction
with the address of the subroutine to be called specified in memory. Function Pointers are typically implemented with indirect subroutine calls. Indirect
Indirect_branch
FUNCTION POINTER
FUNCTION POINTER
Surname or Lastname
English
English : occupational name for a dresser of cloth, Old English fullere (from Latin fullo, with the addition of the English agent suffix). The Middle English successor of this word had also been reinforced by Old French fouleor, foleur, of similar origin. The work of the fuller was to scour and thicken the raw cloth by beating and trampling it in water. This surname is found mostly in southeast England and East Anglia. See also Tucker and Walker.In a few cases the name may be of German origin with the same form and meaning as 1 (from Latin fullare).Americanized version of French Fournier.Samuel Fuller (1589–1633), born in Redenhall, Norfolk, England, was among the Pilgrim Fathers who sailed on the Mayflower in 1620. He was a deacon of the church and until his death functioned as Plymouth Colony’s physician.
Boy/Male
French Greek
Cyrano de Bergerac was a seventeenth-century soldier and science-fiction writer.
Biblical
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Boy/Male
Buddhist, Indian, Japanese
Mysterious Function
Boy/Male
Indian
Friction
Girl/Female
Bengali, Indian
Fraction of Time
Surname or Lastname
English
English : variant spelling of Pointer.
Surname or Lastname
English
English : topographic name for someone who lived by the gates of a medieval walled town. The Middle English singular gate is from the Old English plural, gatu, of geat ‘gate’ (see Yates). Since medieval gates were normally arranged in pairs, fastened in the center, the Old English plural came to function as a singular, and a new Middle English plural ending in -s was formed. In some cases the name may refer specifically to the Sussex place Eastergate (i.e. ‘eastern gate’), known also as Gates in the 13th and 14th centuries, when surnames were being acquired.Americanized spelling of German Götz (see Goetz).Translated form of French Barrière (see Barriere).In New England, Gates was the preferred English version of the name of an extensive French family, called Barrière dit Langevin.
Surname or Lastname
English
English : topographic name for someone who lived by a watercourse or road junction, Old English gelǣt, or a habitational name from Leat in Devon, or The Leete in Essex, named with this element.
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : from the medieval personal name Ponc(h)e, Pons (see Ponce).English (of Norman origin) : habitational name from Ponts in La Manche and Seine-Maritime, Normandy, from Latin pontes ‘bridges’ (see Pont).English (of Norman origin) : nickname for a fop or dandy, from points ‘laces for hose’ (see Pointer 1).
Girl/Female
Tamil
Ankshika | அஂகà¯à®·à¯€à®•à®¾
It’s derived from the root word - anksh that means a fraction. Ankshika means the fraction of the cosmos
Ankshika | அஂகà¯à®·à¯€à®•à®¾
Surname or Lastname
English
English : nickname from the animal, Middle English catte ‘cat’. The word is found in similar forms in most European languages from very early times (e.g. Gaelic cath, Slavic kotu). Domestic cats were unknown in Europe in classical times, when weasels fulfilled many of their functions, for example in hunting rodents. They seem to have come from Egypt, where they were regarded as sacred animals.English : from a medieval female personal name, a short form of Catherine.Variant spelling of German and Dutch Katt.
Surname or Lastname
South German
South German : occupational name for an official in charge of the legal auction of property confiscated in default of a fine; such a sale was known in Middle High German as a gant (from Italian incanto, a derivative of Late Latin inquantare ‘to auction’, from the phrase In quantum? ‘To how much (is the price raised)?’).German : metonymic occupational name for a cooper, from Middle High German ganter, kanter ‘barrel rack’.German : variant of Gander 3.English : occupational name for a glover, from Old French gantier, an agent derivative of gant ‘glove’ (see Gant).
Girl/Female
Afghan, Arabic, Australian, Indian, Muslim
Fiction; Romance; Story
Girl/Female
Indian
It’s derived from the root word - anksh that means a fraction. Ankshika means the fraction of the cosmos
Surname or Lastname
English (Norfolk)
English (Norfolk) : occupational name from Middle English pointer ‘point maker’, an agent derivative of point, a term denoting a lace or cord used to fasten together doublet and hose (Old French pointe ‘point’, ‘sharp end’). Reaney suggests that in some cases Pointer may have been an occupational name for a tiler or slater whose job was to point the tiles, i.e. render them with mortar where they overlapped.Possibly an altered form of German Pointner, a variant of Bainter.
Girl/Female
Hindu, Indian
Fraction of the Cosmos
FUNCTION POINTER
FUNCTION POINTER
Girl/Female
Indian
Girl/Female
Hindu
Very special
Girl/Female
Muslim
A shining star, Rock
Boy/Male
Gujarati, Hindu, Indian
Name of Lord Shiva
Girl/Female
Muslim
Gazelle
Boy/Male
Tamil
Possessed with fire a burning torch
Girl/Female
Indian, Telugu
Good
Boy/Male
Hindi Muslim
Gratitude; thankfulness.
Surname or Lastname
English
English : variant spelling of May.
Girl/Female
English
Love
FUNCTION POINTER
FUNCTION POINTER
FUNCTION POINTER
FUNCTION POINTER
FUNCTION POINTER
n.
The act of anointing, or the state of being anointed; unction; specifically (Med.), the rubbing of ointments into the pores of the skin, by which medicinal agents contained in them, such as mercury, iodide of potash, etc., are absorbed.
n.
The appropriate action of any special organ or part of an animal or vegetable organism; as, the function of the heart or the limbs; the function of leaves, sap, roots, etc.; life is the sum of the functions of the various organs and parts of the body.
v. t.
The act of uniting, or the state of being united; junction.
n.
A derived function; a function obtained from a given function by a certain algebraic process.
n.
A quantity so connected with another quantity, that if any alteration be made in the latter there will be a consequent alteration in the former. Each quantity is said to be a function of the other. Thus, the circumference of a circle is a function of the diameter. If x be a symbol to which different numerical values can be assigned, such expressions as x2, 3x, Log. x, and Sin. x, are all functions of x.
v. t.
To sell by auction.
a.
Pertaining to the function of an organ or part, or to the functions in general.
v. t.
To give sanction to; to ratify; to confirm; to approve.
n.
The act of anointing, smearing, or rubbing with an unguent, oil, or ointment, especially for medical purposes, or as a symbol of consecration; as, mercurial unction.
n.
The place or point of union, meeting, or junction; specifically, the place where two or more lines of railway meet or cross.
v. i.
Alt. of Functionate
n.
The course of action which peculiarly pertains to any public officer in church or state; the activity appropriate to any business or profession.
n.
The natural or assigned action of any power or faculty, as of the soul, or of the intellect; the exertion of an energy of some determinate kind.
n.
The act of joining, or the state of being joined; union; combination; coalition; as, the junction of two armies or detachments; the junction of paths.
n.
The office, duties, or functions of a minister, servant, or agent; ecclesiastical, executive, or ambassadorial function or profession.
v. t.
To supply with an organ or organs having a special function or functions.
a.
Pertaining to, or connected with, a function or duty; official.
n.
The act of feigning, inventing, or imagining; as, by a mere fiction of the mind.
n.
The things sold by auction or put up to auction.
v. t.
To separate by means of, or to subject to, fractional distillation or crystallization; to fractionate; -- frequently used with out; as, to fraction out a certain grade of oil from pretroleum.