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# core.exception

The exception module defines all system-level exceptions and provides a mechanism to alter system-level error handling.
License:
Boost License 1.0.
Authors:
Sean Kelly and Jonathan M Davis

Source core/exception.d

class `RangeError`: object.Error;
  Thrown on a range error.
class `AssertError`: object.Error;
  Thrown on an assert error.
class `FinalizeError`: object.Error;
  Thrown on finalize error.
class `HiddenFuncError`: object.Error;
  Thrown on hidden function error. Deprecated. This feature is not longer part of the language.
class `OutOfMemoryError`: object.Error;
  Thrown on an out of memory error.
class `InvalidMemoryOperationError`: object.Error;
  Thrown on an invalid memory operation.
  An invalid memory operation error occurs in circumstances when the garbage collector has detected an operation it cannot reliably handle. The default D GC is not re-entrant, so this can happen due to allocations done from within finalizers called during a garbage collection cycle.
class `SwitchError`: object.Error;
  Thrown on a switch error.
class `UnicodeException`: object.Exception;
  Thrown on a unicode conversion error.
alias `AssertHandler` = void function(string file, uint line, string msg) nothrow;
nothrow @nogc @property @trusted AssertHandler `assertHandler`();
nothrow @nogc @property @trusted void `assertHandler`(AssertHandler `handler`);
  Gets/sets assert hander. null means the default handler is used.
deprecated nothrow @nogc @trusted void `setAssertHandler`(AssertHandler `h`);
  Overrides the default assert hander with a user-supplied version. Deprecated. Please use assertHandler instead.
  Parameters:

  AssertHandler `h` | The new assert handler. Set to null to use the default handler.

nothrow void `onAssertError`(string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for assert errors in D. The user-supplied assert handler will be called if one has been supplied, otherwise an AssertError will be thrown.
  Parameters:

  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.

nothrow void `onAssertErrorMsg`(string `file`, size_t `line`, string `msg`);
  A callback for assert errors in D. The user-supplied assert handler will be called if one has been supplied, otherwise an AssertError will be thrown.
  Parameters:

  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.
  string `msg` | An error message supplied by the user.

nothrow void `onUnittestErrorMsg`(string `file`, size_t `line`, string `msg`);
  A callback for unittest errors in D. The user-supplied unittest handler will be called if one has been supplied, otherwise the error will be written to stderr.
  Parameters:

  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.
  string `msg` | An error message supplied by the user.

pure nothrow @safe void `onRangeError`(string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for array bounds errors in D. A RangeError will be thrown.
  Parameters:

  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.

  Throws:
  RangeError.
nothrow @trusted void `onFinalizeError`(TypeInfo `info`, Throwable `e`, string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for finalize errors in D. A FinalizeError will be thrown.
  Parameters:

  TypeInfo `info` | The TypeInfo instance for the object that failed finalization.
  Throwable `e` | The exception thrown during finalization.
  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.

  Throws:
  FinalizeError.
deprecated pure nothrow @safe void `onHiddenFuncError`(Object `o`);
  A callback for hidden function errors in D. A HiddenFuncError will be thrown. Deprecated. This feature is not longer part of the language.
  Throws:
  HiddenFuncError.
pure nothrow @nogc @trusted void `onOutOfMemoryError`(void* `pretend_sideffect` = null);
  A callback for out of memory errors in D. An OutOfMemoryError will be thrown.
  Throws:
  OutOfMemoryError.
pure nothrow @nogc @trusted void `onInvalidMemoryOperationError`(void* `pretend_sideffect` = null);
  A callback for invalid memory operations in D. An InvalidMemoryOperationError will be thrown.
  Throws:
  InvalidMemoryOperationError.
pure nothrow @safe void `onSwitchError`(string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for switch errors in D. A SwitchError will be thrown.
  Parameters:

  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.

  Throws:
  SwitchError.
pure @safe void `onUnicodeError`(string `msg`, size_t `idx`, string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for unicode errors in D. A UnicodeException will be thrown.
  Parameters:

  string `msg` | Information about the error.
  size_t `idx` | String index where this error was detected.
  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.

  Throws:
  UnicodeException.
void `_d_assertp`(immutable(char)* `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_assert_msg`(string `msg`, string `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_assert`(string `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_unittestp`(immutable(char)* `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_unittest_msg`(string `msg`, string `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_unittest`(string `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_arrayboundsp`(immutable(char*) `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_arraybounds`(string `file`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.
void `_d_switch_error`(immutable(ModuleInfo)* `m`, uint `line`);
  These functions must be defined for any D program linked against this library.
  Function calls to these are generated by the compiler and inserted into the object code.

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