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Closed 10 years ago.
Why is it not possible to supply a default value that is defined in the parameter list for a struct? That is, why does this work
struct C {int i;};
C cc = {0};
foo(C c=cc) {}
but not
foo(C c={0}) {}
Note, I've noticed that the same holds true for arrays.
Ok, it seems this is a compiler problem with the older GCC.
Related
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Closed 9 years ago.
I gettin not declared in this scope error msg also declared .h file & EngineFactory class in .h
EngineFactory *engineFactory = NULL;
engineFactory = new EngineFactory();
EngineFactory->Create();
EngineFactory->destroy();
There is two problems in the code:
Your code is not inside a function. Place it in main() function, and it'll work better.
EngineFactory->Create(); has uppercase EngineFactory, while your variable is lowercase.
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Closed 9 years ago.
I am inserting 'this' pointer into a map
Does it cause a segmentation fault
My code is
client->commandHandlerMap.insert(std::pair<CommandType , CommandHandler*>(CommandType::OrderBookCommandType , this));
I am doing this inside the member function of a derived class of CommandHandler
I would assume that client is not initialized or has an invalid pointer.
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Closed 9 years ago.
I have the following class:
class clsTree;
{
private:
vector<clsNode*>m_content;
m_RootNode *clsNode;
m_LastNode *clsNode;
public:
vector<clsNode*>Content;
wstring interpret(wstring uWord);
};
The compiler does not like my member declaration of clsNode at all.
The first error I get is "Member clsTree::clsNode is not a type name.".
I don't see where I went wrong.
Can somebody help, please?
You're not showing the definition of clsNode, neither whether you have a forward declaration for it, but I'm pretty sure this:
m_RootNode *clsNode;
m_LastNode *clsNode;
Should be rewritten this way:
clsNode* m_RootNode;
clsNode* m_LastNode;
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Closed 9 years ago.
Ogre::any_cast<std::map<Rail>::iterator>
It takes Ogre::any_cast<std::map<Rail> and says too few arguments etc. How can I fix it (other than obvious typedef aliasing)?
The problem is that std::map takes at least two template arguments - the key type and the value type. Currently you have std::map<Rail>. What are you mapping from Rail to? For example, this would be okay if your iterators are for a std::map that maps from Rail to int (assuming Rail is not a deduced type):
Ogre::any_cast<std::map<Rail,int>::iterator>(some_any_object)
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Closed 10 years ago.
I am a little confused that auto does not work in gcc when there is a struct definition missing. E.g.:
0 struct foo;
1 typedef struct foo foo;
2 int test(foo* pFoo);
3 foo* pEvent = nullptr;
4 const auto var = test(pEvent);
Where on line 4 the compiler complains that it cannot determine what var is. Since test is declared I thought, that it should be a piece of cake. Am I missing something or is this a bug in the gcc implementation?
EDIT:
Sorry, my bad. The toolchain was using the ancient/buggy gcc 4.4. Forcing it to use 4.6 it works like a charm.
It compiles.