casting - Which C++ cast type is a C cast equivalent to -


i guessing c reinterpret cast , bit pattern left is.

i trying understand happen when cast wider signed value narrower signed value. sign preserved, or values in narrower width intepreted signed value.

thanks assistance.

edit--this c99 compiled c code. question isn't c++ compiler sloppy old style cast, rather if there defined c does.

you don't need ask c++ if care c, in example c++ , c still same thing;

c++ says of these integral conversions:

if destination type signed, value unchanged if can represented in destination type (and bit-field width); otherwise, value implementation-defined.

c99 says of these integral conversion:

otherwise, new type signed , value cannot represented in it; either result implementation-defined or implementation-defined signal raised.

casting larger integral value smaller, signed integral value produce same value if possible , give implementation defined (i.e., non-portable) behavior otherwise.

§ 5.4/4 states

the conversions performed by

  • a const_cast (5.2.11),
  • a static_cast (5.2.9),
  • a static_cast followed const_cast,
  • a reinterpret_cast (5.2.10), or
  • a reinterpret_cast followed const_cast,

can performed using cast notation of explicit type conversion.

[...]

if conversion can interpreted in more 1 of ways listed above, interpretation appears first in list used, if cast resulting interpretation ill-formed.

c++ defined such compatible c; is, c casts same thing in c++ in c. means cast notation in c in fact different things based on types being cast between.


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