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    <pre><code>std::size_t n = sizeof( long ); </code></pre> <p>Actually, you haven't asked what specifically seems to be a bad practice int the above. Use of size_t, qualification with std namespace,... </p> <p>As the C++ Standard says (18.1), size_t is a type defined in the standard header . I'd suggest to drop any thoughts and impressions about possible inheritance from C language. C++ is a separate and different language and it's better to consider it as such. It has its own standard library and all elements of C++ Standard Library are defined within namespace std. However, it is possible to use elements of C Standard Library in C++ program.</p> <p>I'd consider including as a dirty hack. The C++ Standard states that the content of headers is the same or based on corresponding headers from the C Standard Library, but in number of cases, changes have been applied. In other words, it's not a direct copy &amp; paste of C headers into C++ headers. </p> <p>size_t is not a built-in type in C++. It is a type defined to specify what kind of integral type is used as a return type of sizeof() operator, because an actual return type of sizeof() is implementation defined, so the C++ Standard unifies by defining size_t.</p> <blockquote> <p>would the following program (with no includes) be expected to compile on all C++ compilers?</p> <pre><code>size_t foo() { return sizeof( long ); } </code></pre> </blockquote> <p>The C++ Standard says (1.4):</p> <p><em>The names defined in the library have namespace scope (7.3). A C ++ translation unit (2.1) obtains access to these names by including the appropriate standard library header (16.2).</em></p> <p>The size_t is a name defined within std namespace, so every program that uses this name should include corresponding header, in this case.</p> <p>Next, the 3.7.3 chapter says:</p> <p><em>However, referring to std, std::bad_alloc, and std::size_t is ill-formed unless the name has been declared by including the appropriate header.</em></p> <p>Given that, program using size_t but not including header is ill-formed.</p>
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