Where are allocators implemented?

1.	Where are allocators implemented?
A.	Standard library
B.	C++ code library
C.	Template library
D.	All of above
E.	None of these
Answer» B. C++ code library

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What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> #include <new> using namespace std; struct N { virtual ~N() { }; void operator delete(void* ptr1) { cout << "N :: operator delete" << endl; } }; struct M : N { void operator delete(void* ptr1) { cout << "M :: operator delete" << endl; } }; int main() { N* ptr2 = new M; delete ptr2; } </pre>
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What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> #include <memory> #include <string> using namespace std; int main () { string str[] = {"Interveiw", "Mania"}; pair <string*, ptrdiff_t> Res = get_temporary_buffer<string>(2); if (Res.second>0) { uninitialized_copy ( str, str + Res.second, Res.first ); for (int k = 0; k < Res.second; k++) cout << Res.first[k] << " "; return_temporary_buffer(Res.first); } return 0; } </pre>
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What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> #include <ctype.h> int main () { int k = 0; char str[] = "Ajit Kumar Gupta"; char ch; while (str[k]) { ch = str[k]; if (islower(ch)) ch = toupper(ch); putchar (ch); k++; } return 0; } </pre>
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Where are allocators implemented?

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