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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 `ArrayIndexError`: core.exception.RangeError;
  Thrown when an out of bounds array index is accessed.
  const size_t `index`;
    Index into array
  const size_t `length`;
    Length of indexed array
class `ArraySliceError`: core.exception.RangeError;
  Thrown when an out of bounds array slice is created
  const size_t `lower`;
    Lower/upper bound passed to slice: array[`lower` .. upper]
  const size_t `upper`;
    Lower/upper bound passed to slice: array[lower .. `upper`]
  const size_t `length`;
    Length of sliced array
class `AssertError`: object.Error;
  Thrown on an assert error.
class `FinalizeError`: object.Error;
  Thrown on finalize error.
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 `ForkError`: object.Error;
  Thrown on a configuration error.
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, ulong 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.
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 @nogc @trusted noreturn `onRangeError`(string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for general 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.
pure nothrow @nogc @trusted noreturn `onArraySliceError`(size_t `lower` = 0, size_t `upper` = 0, size_t `length` = 0, string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for array slice out of bounds errors in D.
  Parameters:

  size_t `lower` | the lower bound of the index passed of a slice
  size_t `upper` | the upper bound of the index passed of a slice or the index if not a slice
  size_t `length` | length of the array
  string `file` | The name of the file that signaled this error.
  size_t `line` | The line number on which this error occurred.

  Throws:
  ArraySliceError.
pure nothrow @nogc @trusted noreturn `onArrayIndexError`(size_t `index` = 0, size_t `length` = 0, string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for array index out of bounds errors in D.
  Parameters:

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

  Throws:
  ArrayIndexError.
nothrow @trusted noreturn `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.
pure nothrow @nogc @trusted noreturn `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 noreturn `onInvalidMemoryOperationError`(void* `pretend_sideffect` = null);
  A callback for invalid memory operations in D. An InvalidMemoryOperationError will be thrown.
  Throws:
  InvalidMemoryOperationError.
pure nothrow @nogc @trusted noreturn `onForkError`(string `file` = __FILE__, size_t `line` = __LINE__);
  A callback for errors in the case of a failed fork in D. A ForkError 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:
  ConfigurationError.
pure @safe noreturn `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`);
  Called when an invalid array index/slice or associative array key is accessed
  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`);
  ditto
  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_slicep`(immutable(char*) `file`, uint `line`, size_t `lower`, size_t `upper`, size_t `length`);
  Called when an out of range slice of an array is created
  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_slice`(string `file`, uint `line`, size_t `lower`, size_t `upper`, size_t `length`);
  ditto
  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_indexp`(immutable(char*) `file`, uint `line`, size_t `index`, size_t `length`);
  Called when an out of range array index is accessed
  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_index`(string `file`, uint `line`, size_t `index`, size_t `length`);
  ditto
  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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