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Business Logic / Control
Endless possibilities in data processing for your projects.
Types of Control Functions
An overview of the types of functions distinguished within Control.
Mapping functions
"remove" (mapping::remove)
Removes the key and the associated value.

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Business Logic / Control
Endless possibilities in data processing for your projects.
- Introduction to CTRL
  An introduction to the product's own programming language Control(CTRL).
- Control Classes
  The overview of classes available in Control.
- Types of Control Functions
  An overview of the types of functions distinguished within Control.
  - Control Function - User Administration
  - Database functions
  - File functions
  - Data point functions
  - Selection and configuration dialogs
  - Vector / Dynamic arrays
  - Error functions
  - Window functions
  - Functions for bit32/bit64 variables
  - Functions for blob variables
  - Graphics functions
  - Communication functions
  - Multilingual functionality
  - Mapping functions
    - "clear" (mapping::clear)
      Empties the mapping.
    - "contains"(mapping::contains)
      Returns true if the key is already in the mapping.
    - "count" (mapping::count)
      Returns the number of keys.
    - "insert" (mapping::insert)
      Insert a key/value pair.
    - "isEmpty" (mapping::isEmpty)
      Returns true if the mapping is empty.
    - "keys" (mapping::keys)
      Returns a list containing all the keys in a mapping in an arbitrary order.
    - "keyAt" (mapping::keyAt)
      Returns the key at the given index position.
    - "merged" (mapping::merged)
      This function creates a new instance by merging two mappings.
    - "remove" (mapping::remove)
      Removes the key and the associated value.
    - "value" (mapping::value)
      Returns the value at given key or the defaultValue if the key is not found.
    - "values"(mapping::values)
      Returns a list containing all values in a mapping, in an arbitrary order. The order is the same as that used by keys().
    - "valueAt" (mapping::valueAt)
      Returns the value at the given index position.
  - Mathematical functions
  - Multilingual functionality
  - Alert handling
  - MindSphere Connector Functions
  - Project administration functions
  - Query functions
  - Redu/Dist functions
  - Semaphore Functions
  - String functions
  - Threads
  - Vector / Dynamic arrays
  - Administration of managers, modules and panels
  - Waiting Control functions
  - XML Control Extension
  - Time functions
  - Miscellaneous functions
  - Reference - Focus Policy
  - Help Viewer Functions
    Available Functions for the Help Viewer.
- Control graphics
- CONTROL Functions
- CtrlExtension
  The CtrlExtension allows the addition of custom C++ code.
- CTRL Debugger
  You can use the CTRL debugger to debug the Control programming language. The debugger can be used via its own panel, which also enables the monitoring and setting of variable values during the execution of a script.
- SQL in CONTROL
  The database functions enable you to quickly carry out value queries on data points and elements.
- API Manager
  The WinCC OA API (Application Programming Interface) offers a number of functions adding special Managers to this process control system.
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WinCC OA Documentation
Basic information about terms and functions within the documentation.
Disclaimer
A brief clarification of liability exclusions or legal notices.

"remove" (mapping::remove)

Removes the key and the associated value.

Synopsis

int mapping.remove(T key);

Parameters


Parameter	Description
key	Mapping key

Description

Assignment

Mapping