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Clarify typecasting

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This commit is contained in:
Denton Liu 2016-08-25 14:19:35 -04:00
parent f125b2813e
commit 9ace0ca310
1 changed files with 7 additions and 2 deletions
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docs/types.rst
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@ -661,13 +661,18 @@ Explicit Conversions
-------------------- --------------------
If the compiler does not allow implicit conversion but you know what you are If the compiler does not allow implicit conversion but you know what you are
doing, an explicit type conversion is sometimes possible:: doing, an explicit type conversion is sometimes possible. Note that this may
give you some unexpected behaviour so be sure to test to ensure that the
result is what you want! Take the following example where you are converting
a negative ``int8`` to a ``uint``:
::
int8 y = -3; int8 y = -3;
uint x = uint(y); uint x = uint(y);
At the end of this code snippet, ``x`` will have the value ``0xfffff..fd`` (64 hex At the end of this code snippet, ``x`` will have the value ``0xfffff..fd`` (64 hex
characters), which is -3 in two's complement representation of 256 bits. characters), which is -3 in the two's complement representation of 256 bits.
If a type is explicitly converted to a smaller type, higher-order bits are If a type is explicitly converted to a smaller type, higher-order bits are
cut off:: cut off::