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c常用泛型函数(Ccommonlyusedgenericfunctions)
c++常用泛型函数(C++ commonly used generic functions) Functions in algorithm (count) an example of a function: Algorithm example / / count #include iostream #include algorithm #include vector Using namespace std; Int (main) { Int mycount; Elements in array: / / counting Int myints[] = {10,20,30,30,20,10,10,20}; / / elements 8 MYCOUNT = (int) count (myints, myints+8, 10); The 10 appears cout MYCOUNT times.\n ; Elements in container: / / counting Vectorint MyVector (myints, myints+8); MYCOUNT = (int) count (myvector.begin), myvector.end (), (20); The 20 appears cout MYCOUNT times.\n ; Return 0; } (find) an example of a function: InputIterator find (InputIterator first, InputIterator last, const T value); Find / / example #include iostream #include algorithm #include vector Using namespace std; Int (main) { Int myints[] = {10, 20, 30, 40}; Int * p; To array element: / / pointer P = find (myints, myints+4,30); ++p; Cout The element following *p endl 30 is ; Vectorint MyVector (myints, myints+4); Vectorint: iterator: it; To vector element: / / iterator It = find (myvector.begin), myvector.end (), (30); ++it; Cout The element following *it endl 30 is ; Return 0; } Find_first_of (example) Find_first_of / / example #include iostream #include algorithm #include cctype #include vector Using namespace std; Bool comp_case_insensitive (char C1, char C2) { Return (tolower (C1) ==tolower (C2)); } Int (main) { Int mychars[] = {a,b,c,A,B,C}; Vectorchar MyVector (mychars, mychars+6); Vectorchar: iterator: it; Int match[] = {A,B,C}; Default comparison: / / using It = find_first_of (myvector.begin), myvector.end (), match (, match+3); If (=myvector.end) (it!) Cout first match is: *it endl ; Predicate comparison: / / using It = find_first_of (myvector.begin (), myvector.end (), Match, match+3, comp_case_insensitive); If (=myvector.end) (it!) Cout first match is: *it endl ; Return 0; } (reverse) to achieve reversal (reverse_copy) to achieve reversal, does not change the original string. (sort)
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