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POWhat are С++ temporaries?
 

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    <p>I was reading the constant chapter in Eckel and got mixed up in the part where Temporaries were explained . What I could get was that when we pass the reference to a function , the compiler creates a temporary which is a const object and so we can't modify it even if we pass a reference as</p> <pre><code>f(int &amp;a){} </code></pre> <p>Now I tried to look at some other references for Temporaries online and got stuck up<br><br> <a href="http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Fcplr382.htm" rel="nofollow noreferrer">http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Fcplr382.htm</a> and<br><br> <a href="https://stackoverflow.com/questions/2145030/are-all-temporaries-rvalues-in-c">Are all temporaries rvalues in C++?</a><br><br> which prompted me that temporaries are much more than just passing references and creating const object for that inside the functions.Now I could get something out of these two links but could not say that I have understood the working , functionality and use of temporaries as a whole. It would be really helpful if someone could explain the concept of temporaries. Thanks in advance.<br>The original example of bruce eckel is:<br></p> <pre><code>// Result cannot be used as an lvalue class X { int i; public: X(int ii = 0); void modify(); }; X::X(int ii) { i = ii; } void X::modify() { i++; } X f5() { return X(); } const X f6() { return X(); } void f7(X&amp; x) { // Pass by non-const reference x.modify(); } int main() { f5() = X(1); // OK -- non-const return value f5().modify(); // OK // Causes compile-time errors: //! f7(f5()); //! f6() = X(1); //! f6().modify(); //! f7(f6()); } ///:~ </code></pre>
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    1. COReferences and temporaries are not directly related. It has to do with how the object is created/destroyed. Perhaps you better start again..
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