16.2.3 Casts
C++ introduced a collection of named casting operators to replace
the conventional C-style cast of the form (type) expr . The new
casting operators are static_cast , reinterpret_cast ,
dynamic_cast and const_cast . They are reserved words.
These refined casting operators are vastly preferred over conventional C
casts for C++ programming. In fact, even Stroustrup recommends that the
older style of C casts be banished from programming projects where at
all possible The C++ Programming Language, 3rd edition. Reasons
for preferring the new named casting operators include:
- They provide the programmer with a mechanism for more explicitly
specifying the kind of type conversion. This assists the compiler in
identifying incorrect conversions.
- They are easier to locate in source code, due to their unique
syntax:
X_cast<type>(expr) .
If your compiler does not support the new casting operators, you may
have to continue to use C-style casts--and carefully! I have seen one
project agree to use macros such as the one shown below to encourage
those involved in the project to adopt the new operators. While the
syntax does not match that of the genuine operators, these macros make
it easy to later locate and alter the casts where they appear in source
code.
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#define static_cast(T,e) (T) e
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