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2011-09-13T10:50:54.940
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There are many other subtle points surrounding const correctness in C++. I suppose the question here has simply been about C, but I'll give some related examples since the tag is C++ : <ul> <li>You often pass large arguments like strings as <code>TYPE const &</code> which prevents the object from being either modified or copied. Example : <code>TYPE& TYPE::operator=(const TYPE &rhs) { ... return *this; }</code> But <code>TYPE & const</code> is meaningless because references are always const.</li> <li>You should always label class methods that do not modify the class as <code>const</code>, otherwise you cannot call the method from a <code>TYPE const &</code> reference. Example : <code>bool TYPE::operator==(const TYPE &rhs) const { ... }</code></li> <li>There are common situations where both the return value and the method should be const. Example : <code>const TYPE TYPE::operator+(const TYPE &rhs) const { ... }</code> In fact, const methods must not return internal class data as a reference-to-non-const.</li> <li>As a result, one must often create both a const and a non-const method using const overloading. For example, if you define <code>T const& operator[] (unsigned i) const;</code>, then you'll probably also want the non-const version given by : <code>inline T& operator[] (unsigned i) { return const_cast<char&>( static_cast<const TYPE&>(*this)[](i) ); }</code></li> </ul> Afaik, there are no const functions in C, non-member functions cannot themselves be const in C++, const methods might have side effects, and the compiler cannot use const functions to avoid duplicate function calls. In fact, even a simple <code>int const &</code> reference might witness the value to which it refers be changed elsewhere.
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1. POWhat is the difference between const int*, const int * const, and int const *?
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1. USJeff Burdges
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