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Merge pull request #596 from tkruse/style-fix27

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Style fix27
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Andrew Pardoe
2016-04-24 09:58:29 -07:00
parent e54a779669 122ce83509
commit 3b93c16fbd
1 changed files with 96 additions and 92 deletions
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CppCoreGuidelines.md
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@@ -6868,6 +6868,7 @@ Union rule summary:
##### Example ##### Example
??? ???
##### Enforcement ##### Enforcement
@@ -6878,6 +6879,7 @@ Union rule summary:
##### Reason ##### Reason
Naked unions are a source of type errors. Naked unions are a source of type errors.
**Alternative**: Wrap them in a class together with a type field. **Alternative**: Wrap them in a class together with a type field.
@@ -6888,6 +6890,8 @@ Naked unions are a source of type errors.
??? ???
##### Enforcement ##### Enforcement
??? ???
@@ -10405,7 +10409,7 @@ Not all data races are as easy to spot as this one.
} }
Now, a compiler that does not know that `val` can change will most likely implement that `switch` using a jump table with five entries. Now, a compiler that does not know that `val` can change will most likely implement that `switch` using a jump table with five entries.
Then, a `val` outside the [0..4] range will cause a jump to an address that could be anywhere in the program, and execution would proceed there. Then, a `val` outside the `[0..4]` range will cause a jump to an address that could be anywhere in the program, and execution would proceed there.
Really, "all bets are off" if you get a data race. Really, "all bets are off" if you get a data race.
Actually, it can be worse still: by looking at the generated code you may be able to determine where the stray jump will go for a given value; Actually, it can be worse still: by looking at the generated code you may be able to determine where the stray jump will go for a given value;
this can be a security risk. this can be a security risk.