StackOverflow2013

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primarykey
Id
651744
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AcceptedAnswerId
0
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0
ClosedDate
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0
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CreationDate
2009-03-16T19:05:09.243
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0
LastActivityDate
2009-03-16T19:11:19.337
LastEditDate
2009-03-16T19:11:19.337
LastEditorUserId
33345
OwnerUserId
33345
ParentId
651698
PostTypeId
2
Score
2
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0
LastEditorDisplayName
greyfade
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Body
<blockquote> when they are represented in memory are objects C++ objects the same as C structs. </blockquote> Strictly speaking, no. In general, yes. C++ classes and structs are identical in memory layout to C structs except: <ul> <li>Bit fields have different packing rules</li> <li>Sizes are fixed at compile time</li> <li>If there are any virtual functions, the compiler will add a vtable entry to the memory layout.</li> <li>If the object inherits a base class, the new class' layout will be appended to the base class layout, including vtable, if any.</li> </ul> <blockquote> I don't think C++ allows overloading the + operator for the built in char * type. so i'd like to create my own lightweight string class which has no extra overhead std::string has. I think std::string is represented contiguously </blockquote> You can create a <code>operator+</code> overload for the <code>char*</code> type. Normal behavior is pointer arithmetic. <code>std::string</code> overloads <code>operator+</code> to append <code>char*</code> data to the string. The string is stored in memory as a C string, plus additional information. The <code>c_str()</code> member function returns a pointer to the internal <code>char</code> array. In your C example, you're relying on undefined behavior. Don't <code>realloc</code> like that. It can result in Bad Things - namely bizarre segfaults. Your C++ example is also doing Bad Things in doing <code>realloc(this)</code>. Instead, you should carry a <code>char*</code> and get a <code>new char[]</code> buffer to store the chars in instead of a <code>realloc()</code>. Behavior for such a <code>realloc</code> is undefined.
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1. PORealloc()/Resize an object in C++ for a string implementation
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