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7 commits

Author SHA1 Message Date
Ben Wiederhake
0e27a6e39e AK: Demonstrate and fix Checked 
Specifically:
- post-increment actually implemented pre-increment
- helper-templates that provided operator{+,-,*,/}() couldn't possibly work,
  because the interface of add (etc) were incompatible (not taking a Checked<>,
  and returning void)
 2020-08-26 00:55:13 +02:00
Sergey Bugaev
c3db694d9b AK: Always inline some Checked methods 
Once again, we need to hint the compiler that it should inline the function, and
then it is able to eliminate the assertion.
 2020-05-31 21:38:50 +02:00
Sergey Bugaev
000a9cad34 AK: Fix Checked::multiplication_would_overflow() signature 
The two-argument version doesn't need an extra template parameter.
 2020-05-20 08:31:31 +02:00
Andreas Kling
ea839861e5 AK: Make Checked.h work with Clang 
Apparently Clang does not have __builtin_foo_overflow_p()

Fixes #2044.
 2020-05-01 17:30:47 +02:00
Sergey Bugaev
361a1b54d7 AK: Add Checked::addition_would_overflow() 
And switch the two-argument version of Checked::multiplication_would_overflow()
to use __builtin_mul_overflow_p(). This helps GCC optimize the code better.
 2020-04-30 11:30:27 +02:00
Andreas Kling
63b8c6913c AK: Add Checked<T>::multiplication_would_overflow() 
This allows you to comfortably test if multiply 2 or 3 values would
cause arithmetic overflow.
 2020-04-15 17:14:18 +02:00
Andreas Kling
9c54bad241 AK: Add a Checked<T> template 
A Checked<T> is a boxed integer type that asserts if you try to use its
value after an arithmetic overflow.
 2020-04-15 16:58:46 +02:00