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Merge pull request #530 from tituswinters/es-casts

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Add note on brace-init for type conversion.
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Gabriel Dos Reis 2016-02-17 07:49:12 -08:00
commit f6b0766bd7
1 changed files with 11 additions and 2 deletions
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@ -9394,7 +9394,7 @@ Flag literals in code. Give a pass to `0`, `1`, `nullptr`, `\n`, `""`, and other
A narrowing conversion destroys information, often unexpectedly so. A narrowing conversion destroys information, often unexpectedly so.
##### Example ##### Example, bad
A key example is basic narrowing: A key example is basic narrowing:
@ -9512,7 +9512,16 @@ The named casts are:
##### Note ##### Note
??? When converting between types with no information loss (e.g. from float to
double or int64 from int32), brace initialization may be used instead.
double d{some_float};
int64_t i{some_int32};
This makes it clear that the type conversion was intended and also prevents
conversions between types that might result in loss of precision. (It is a
compilation error to try to initialize a float from a double in this fashion,
for example.)
##### Enforcement ##### Enforcement