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.. title:: clang-tidy - bugprone-unhandled-exception-at-new
bugprone-unhandled-exception-at-new
===================================
Finds calls to ``new`` with missing exception handler for ``std::bad_alloc``.
Calls to ``new`` may throw exceptions of type ``std::bad_alloc`` that should
be handled. Alternatively, the nonthrowing form of ``new`` can be
used. The check verifies that the exception is handled in the function
that calls ``new``.
If a nonthrowing version is used or the exception is allowed to propagate out
of the function no warning is generated.
The exception handler is checked if it catches a ``std::bad_alloc`` or
``std::exception`` exception type, or all exceptions (catch-all).
The check assumes that any user-defined ``operator new`` is either
``noexcept`` or may throw an exception of type ``std::bad_alloc`` (or one
derived from it). Other exception class types are not taken into account.
.. code-block:: c++
int *f() noexcept {
int *p = new int[1000]; // warning: missing exception handler for allocation failure at 'new'
// ...
return p;
}
.. code-block:: c++
int *f1() { // not 'noexcept'
int *p = new int[1000]; // no warning: exception can be handled outside
// of this function
// ...
return p;
}
int *f2() noexcept {
try {
int *p = new int[1000]; // no warning: exception is handled
// ...
return p;
} catch (std::bad_alloc &) {
// ...
}
// ...
}
int *f3() noexcept {
int *p = new (std::nothrow) int[1000]; // no warning: "nothrow" is used
// ...
return p;
}
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