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9699546
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2012-03-14T09:54:27.247
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2012-03-14T10:07:24.590
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2012-03-14T10:07:24.590
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I just tried the equivalent in g++ 4.5 C++0x mode for char arrays and it won't let me both define <pre><code>template <typename T>void moresilly(const T v[],const char *description) </code></pre> AND <pre><code>template <typename T>void moresilly(const T *v,const char *description) </code></pre> it claims both are the same type. I had a function: <pre><code>template <typename T>void silly(const T & v,const char *description) { cout<<"size of "<<description<<" is "<< sizeof(T)<<endl; moresilly(v,description); } </code></pre> It correctly gets the size of an array if passed and of a pointer if passed, but I can't use moresilly to distinguish between pointer and array, so I can't tell a 4 character array from pointer to n characters. It might work, sort of, to have templates on T[1],T[2], T[3] etc. but there's already a post saying that different compilers handle that (or some similar case) differently and that gnu prefers a pointer match in C++11. ... added later: After some experiment I found something that works in g++ 4.5 <pre><code>template <typename T,size_t L>void moresilly(const T (&v)[L],const char *description) { cout<<description<<" is an array"<<endl; } template <typename T>void moresilly(const T *v,const char *description) { cout<<description<<" is a pointer"<<endl; } template <typename T>void moresilly(const T v,const char *description) { cout<<description<<" is a raw value"<<endl; } template <typename T>void silly(const T & v,const char *description) { cout<<"size of "<<description<<" is "<< sizeof(T)<<endl; moresilly(v,description); } </code></pre> with the following works properly <pre><code> silly("12345","immediate string of 5 characters plus zero"); silly((const char *)"12345","immediate constant char pointer of 5 characters plus zero"); char testarray[]="abcdef"; silly(testarray,"char array of 6 characters plus zero"); const char testarray2[]="abcdefg"; silly(testarray2,"const char array of 7 characters plus zero"); </code></pre> Note that if the first function is defined with "const T v[L]" instead of "const T (&v)[L]" it doesn't work, never matching anything. So I solved your problem but don't expect this to work in other versions of the compiler including future ones. This is why I hate c++. Somehow the definition of the language is so unclear that compilers are full of unstable edge cases. This is a useful trick though, I may use it.
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1. POarray of integers vs. pointer to integer in c++
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1. USJosh S
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