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AP_Common: add template to check structure size 

This has the advantage of telling you what the sizes are

In file included from ../../libraries/AC_AttitudeControl/AC_PosControl.h:3:
../../libraries/AP_Common/AP_Common.h:103:3: fatal error: static_assert failed "wrong size"
  static_assert(s == t, "wrong size");
  ^             ~~~~~~
../../libraries/AP_Common/AP_Common.h:147:52: note: in instantiation of template class 'assert_structure_size<12, 11>' requested here
assert_structure_size<sizeof(struct Location), 11> _assert_location_size;
This commit is contained in:
Peter Barker 2019-01-01 08:52:36 +11:00 committed by Peter Barker
parent 99120cddf9
commit 4dc157951b
1 changed files with 14 additions and 0 deletions
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14
libraries/AP_Common/AP_Common.h
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@ -100,6 +100,20 @@
// @}
// assert_storage_size template: assert that the memory used to store an
// item is of a specific size.
// example invocation:
// assert_storage_size<class Location, 16> _assert_storage_size_Location;
// templates are used for this because the compiler's output will
// usually contain details of the template instantiation so you can
// see how the actual size differs from the expected size.
template<typename s, int s_size, int t> struct _assert_storage_size {
static_assert(s_size == t, "wrong size");
};
template<typename s, int t> struct assert_storage_size {
_assert_storage_size<s, sizeof(s), t> _member;
};
////////////////////////////////////////////////////////////////////////////////
/// @name Types
///