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In modern C++, in most scenarios, the preferred way to report and handle both logic errors and runtime errors is to use exceptions. It's especially true when the stack might contain several function calls between the function that detects the error, and the function that has the context to handle the error. Exceptions provide a formal, well-defined way for code that detects errors to pass the information up the call stack.

Use exceptions for exceptional code

Program errors are often divided into two categories: Logic errors that are caused by programming mistakes, for example, an 'index out of range' error. And, runtime errors that are beyond the control of programmer, for example, a 'network service unavailable' error. In C-style programming and in COM, error reporting is managed either by returning a value that represents an error code or a status code for a particular function, or by setting a global variable that the caller may optionally retrieve after every function call to see whether errors were reported. For example, COM programming uses the HRESULT return value to communicate errors to the caller. And the Win32 API has the GetLastError function to retrieve the last error that was reported by the call stack. In both of these cases, it's up to the caller to recognize the code and respond to it appropriately. If the caller doesn't explicitly handle the error code, the program might crash without warning. Or, it might continue to execute using bad data and produce incorrect results.

Exceptions are preferred in modern C++ for the following reasons:

• An exception forces calling code to recognize an error condition and handle it. Unhandled exceptions stop program execution.

• An exception jumps to the point in the call stack that can handle the error. Intermediate functions can let the exception propagate. They don't have to coordinate with other layers.

• The exception stack-unwinding mechanism destroys all objects in scope after an exception is thrown, according to well-defined rules.

• An exception enables a clean separation between the code that detects the error and the code that handles the error.

The following simplified example shows the necessary syntax for throwing and catching exceptions in C++.

Exceptions in C++ resemble ones in languages such as C# and Java. In the try block, if an exception is thrown it will be caught by the first associated catch block whose type matches that of the exception. In other words, execution jumps from the throw statement to the catch statement. If no usable catch block is found, std::terminate is invoked and the program exits. In C++, any type may be thrown; however, we recommend that you throw a type that derives directly or indirectly from std::exception. In the previous example, the exception type, invalid_argument, is defined in the standard library in the <stdexcept> header file. C++ doesn't provide or require a finally block to make sure all resources are released if an exception is thrown. The resource acquisition is initialization (RAII) idiom, which uses smart pointers, provides the required functionality for resource cleanup. For more information, see How to: Design for exception safety. For information about the C++ stack-unwinding mechanism, see Exceptions and stack unwinding.

Basic guidelines

Robust error handling is challenging in any programming language. Although exceptions provide several features that support good error handling, they can't do all the work for you. To realize the benefits of the exception mechanism, keep exceptions in mind as you design your code.

• Use asserts to check for errors that should never occur. Use exceptions to check for errors that might occur, for example, errors in input validation on parameters of public functions. For more information, see the Exceptions versus assertions section.

• Use exceptions when the code that handles the error is separated from the code that detects the error by one or more intervening function calls. Consider whether to use error codes instead in performance-critical loops, when code that handles the error is tightly coupled to the code that detects it.

• For every function that might throw or propagate an exception, provide one of the three exception guarantees: the strong guarantee, the basic guarantee, or the nothrow (noexcept) guarantee. For more information, see How to: Design for exception safety.

• Throw exceptions by value, catch them by reference. Don’t catch what you can't handle.

• Don't use exception specifications, which are deprecated in C++11. For more information, see the Exception specifications and noexcept section.

• Use standard library exception types when they apply. Derive custom exception types from the exception Class hierarchy.

• Don't allow exceptions to escape from destructors or memory-deallocation functions.

Exceptions and performance

The exception mechanism has a minimal performance cost if no exception is thrown. If an exception is thrown, the cost of the stack traversal and unwinding is roughly comparable to the cost of a function call. Additional data structures are required to track the call stack after a try block is entered, and additional instructions are required to unwind the stack if an exception is thrown. However, in most scenarios, the cost in performance and memory footprint isn't significant. The adverse effect of exceptions on performance is likely to be significant only on memory-constrained systems. Or, in performance-critical loops, where an error is likely to occur regularly and there's tight coupling between the code to handle it and the code that reports it. In any case, it's impossible to know the actual cost of exceptions without profiling and measuring. Even in those rare cases when the cost is significant, you can weigh it against the increased correctness, easier maintainability, and other advantages that are provided by a well-designed exception policy.

Exceptions versus assertions

Exceptions and asserts are two distinct mechanisms for detecting run-time errors in a program. Use assert statements to test for conditions during development that should never be true if all your code is correct. There's no point in handling such an error by using an exception, because the error indicates that something in the code has to be fixed. It doesn't represent a condition that the program has to recover from at run time. An assert stops execution at the statement so that you can inspect the program state in the debugger. An exception continues execution from the first appropriate catch handler. Use exceptions to check error conditions that might occur at run time even if your code is correct, for example, 'file not found' or 'out of memory.' Exceptions can handle these conditions, even if the recovery just outputs a message to a log and ends the program. Always check arguments to public functions by using exceptions. Even if your function is error-free, you might not have complete control over arguments that a user might pass to it.

C++ exceptions versus Windows SEH exceptions

Both C and C++ programs can use the structured exception handling (SEH) mechanism in the Windows operating system. The concepts in SEH resemble the ones in C++ exceptions, except that SEH uses the __try, __except, and __finally constructs instead of try and catch. In the Microsoft C++ compiler (MSVC), C++ exceptions are implemented for SEH. However, when you write C++ code, use the C++ exception syntax.

For more information about SEH, see Structured Exception Handling (C/C++).

Exception specifications and noexcept

Exception specifications were introduced in C++ as a way to specify the exceptions that a function might throw. However, exception specifications proved problematic in practice, and are deprecated in the C++11 draft standard. We recommend that you don't use throw exception specifications except for throw(), which indicates that the function allows no exceptions to escape. If you must use exception specifications of the deprecated form throw( type-name ), MSVC support is limited. For more information, see Exception Specifications (throw). The noexcept specifier is introduced in C++11 as the preferred alternative to throw().

See also

How to: Interface between exceptional and non-exceptional code
C++ language reference
C++ Standard Library

Struck by hit or thrown ball, unspecified type, subsequent encounter

201620172018201920202021Billable/Specific CodePOA Exempt

• W21.00XD is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Struck by hit or thrown ball, unspecified type, subs encntr
• The 2021 edition of ICD-10-CM W21.00XD became effective on October 1, 2020.
• This is the American ICD-10-CM version of W21.00XD - other international versions of ICD-10 W21.00XD may differ.

• W21.00XD describes the circumstance causing an injury, not the nature of the injury.

• Applicable To annotations, or
• Code Also annotations, or
• Code First annotations, or
• Excludes1 annotations, or
• Excludes2 annotations, or
• Includes annotations, or
• Note annotations, or
• Use Additional annotations

• V00-Y99
  2021 ICD-10-CM Range V00-Y99

  External causes of morbidity

  Note

  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.
  External causes of morbidity
• W20-W49
  2021 ICD-10-CM Range W20-W49

  Exposure to inanimate mechanical forces

  Type 1 Excludes

  • assault (X92-Y09)
  • contact or collision with animals or persons (W50-W64)
  • exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)
  • intentional self-harm (X71-X83)
  Exposure to inanimate mechanical forces
• W21
  ICD-10-CM Diagnosis Code W21

  Striking against or struck by sports equipment

  201620172018201920202021Non-Billable/Non-Specific Code

  Type 1 Excludes

  • assault with sports equipment (Y08.0-)
  • striking against or struck by sports equipment with subsequent fall (W18.01)
  Striking against or struck by sports equipment

• W21.00XD is considered exempt from POA reporting.

Convert W21.00XD to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change

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Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.