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Ran 25 Jan 2019 09:42PM UTC

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Committed 25 Jan 2019 09:36PM UTC coverage: 100.0%. Remained the same

Job # COMPILER=g++-7 CXXFLAGS="-O0 --coverage -fno-inline -fno-inline-small-functions -fno-default-inline"

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push

travis-ci

Committed by

skypjack

Commit Message

Fix sparse_set invalid state when component constructor throws (#176)

Fix sparse_set invalid state when component constructor throws

Previously, a component's constructor that throws would cause the sparse
set to think that the entity still exists in the set. This is because the underlying
sparse set that stores the entities will have its entry added before the component
is added to the component set.

This could cause a number of invalid memory access problems such as the following:

1) Exception triggers destructor of enclosing object that then tries to remove
   the component that was just added. SparseSet<entity_t, Component>::has() will
   return true for the entity but when destroy() is called "instances" will be empty
   so instances.back() will be invalid.

2) If the exception is handled then calling get(entity) for the same entity
   identifier that initially threw the exception will give a position for that
   entity even though it was not added. This can cause an invalid memory access
   or accessing the data of a different stored component.

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