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copied!<p>First of all, it depends on Compiler. Compiler in turns usually depends on the architecture, processor, development environment etc because it takes them into account. So you may say it's a combination of all. <strong>But I would NOT say that. I would say, Compiler</strong>, since on the same machine you may have different sizes of POD and <em>built-in</em> types, if you use different compilers. Also note that your source code is input to the compiler, so it's the compiler which makes <strong>final</strong> decision of the sizes of POD and built-in types. However, it's also true that this decision is influenced by the underlying architecture of the target machine. After all, the real <strong><em>useful</em></strong> compiler <strong>has to</strong> emit <em>efficient</em> code that eventually runs on the machine you target.</p> <p>Compilers provides <code>options</code> too. Few of them might effect sizes also!</p> <hr> <h1>EDIT: What Standards say,</h1> <p><br/></p> <p>Size of <code>char</code>, <code>signed char</code> and <code>unsigned char</code> is defined by C++ Standard itself! Sizes of all other types are defined by the compiler.</p> <p>C++03 Standard $5.3.3/1 says,</p> <blockquote> <p>sizeof(char), sizeof(signed char) and sizeof(unsigned char) are 1; the result of sizeof applied to <strong>any other</strong> fundamental type (3.9.1) is implementation-defined. [Note: in particular,sizeof(bool) and sizeof(wchar_t) are implementation-defined.69)</p> </blockquote> <p>C99 Standard ($6.5.3.4) also itself defines the size of <code>char</code>, <code>signed char</code> and <code>unsigned char</code> to be 1, but leaves the size of other types to be defined by the compiler!</p> <hr> <p>EDIT:</p> <p>I found this C++ FAQ chapter really good. The entire chapter. It's very tiny chapter though. :-)</p> <p><a href="http://www.parashift.com/c++-faq-lite/intrinsic-types.html" rel="nofollow">http://www.parashift.com/c++-faq-lite/intrinsic-types.html</a></p> <hr> <p>Also read the comments below, there are some good arguments!</p>

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