TUPLES I C ++

En tuple er et objekt, der kan indeholde et antal elementer. Elementerne kan være af forskellige datatyper. Elementerne i tuples initialiseres som argumenter for at få adgang til. Tuples er en alsidig datastruktur til gruppering af værdier. For at forstå, hvordan man bruger tuples i C ++ og deres applikationer C ++ kursus Tilbyder omfattende tutorials og eksempler.

Operationer på tuple

1. få (): Get () bruges til at få adgang til tuple -værdierne og ændre dem, den accepterer indekset og tuple -navnet som argumenter for at få adgang til et bestemt tuple -element.

2. make_tuple (): make_tuple () bruges til at tildele tuple med værdier. De overførte værdier skal være i orden med de værdier, der er erklæret i tuple.

CPP

#include    #include  using namespace std; int main() {    // Declaring tuple  tuple<char int float> geek;  // Assigning values to tuple using make_tuple()  geek = make_tuple('a' 10 15.5);  // Printing initial tuple values using get()  cout << 'The initial values of tuple are: ';  cout << get<0>(geek) << ' ' << get<1>(geek);  cout << ' ' << get<2>(geek) << endl;  // Use of get() to change values of tuple  get<0>(geek) = 'b';  get<2>(geek) = 20.5;  // Printing modified tuple values  cout << 'The modified values of tuple are: ';  cout << get<0>(geek) << ' ' << get<1>(geek);  cout << ' ' << get<2>(geek) << endl;  return 0; }

Produktion

The initial values of tuple are: a 10 15.5 The modified values of tuple are: b 10 20.5

Forklaring : I ovenstående kode skal du () ændre den første og 3. værdi af tuple.

3. tuple_size: Det returnerer antallet af elementer, der findes i tuple.

CPP

#include    #include  using namespace std; int main() {    // Initializing tuple  tuple<char int float> geek(20 'g' 17.5);  // Use of size to find tuple_size of tuple  cout << 'The size of tuple is: ';  cout << tuple_size<decltype(geek)>::value;  return 0; }

Produktion

The size of tuple is: 3

4. swap (): Swap () bytter elementerne i de to forskellige tuples.

CPP

#include    #include  using namespace std; int main() {    // Initializing 1st tuple  tuple<int char float> tup1(20 'g' 17.5);  // Initializing 2nd tuple  tuple<int char float> tup2(10 'f' 15.5);  // Printing 1st and 2nd tuple before swapping  cout << 'The first tuple elements before swapping are: ';  cout << get<0>(tup1) << ' ' << get<1>(tup1) << ' ' << get<2>(tup1) << endl;  cout << 'The second tuple elements before swapping are: ';  cout << get<0>(tup2) << ' ' << get<1>(tup2) << ' ' << get<2>(tup2) << endl;  // Swapping tup1 values with tup2  tup1.swap(tup2);  // Printing 1st and 2nd tuple after swapping  cout << 'The first tuple elements after swapping are: ';  cout << get<0>(tup1) << ' ' << get<1>(tup1) << ' ' << get<2>(tup1) << endl;  cout << 'The second tuple elements after swapping are: ';  cout << get<0>(tup2) << ' ' << get<1>(tup2) << ' ' << get<2>(tup2) << endl;  return 0; }

Produktion

The first tuple elements before swapping are: 20 g 17.5  
The second tuple elements before swapping are: 10 f 15.5  
The first tuple elements after swapping are: 10 f 15.5  
The second tuple elements after swapping are: 20 g 17.5

5. slips () : Arbejdet med slips () er at pakke tuple -værdierne ud i separate variabler. Der er to varianter af slips () med og uden 'ignorere' 'ignorere' ignorerer et bestemt tuple -element og forhindrer det i at blive pakket ud.

CPP

#include    #include  // for tie() and tuple using namespace std; int main() {   // Initializing variables for unpacking  int i_val;  char ch_val;  float f_val;     // Initializing tuple  tuple<int char float> tup1(20 'g' 17.5);  // Use of tie() without ignore  tie(i_val ch_val f_val) = tup1;    // Displaying unpacked tuple elements without ignore  cout << 'The unpacked tuple values (without ignore) are: ';  cout << i_val << ' ' << ch_val << ' ' << f_val;  cout << endl;    // Use of tie() with ignore  // ignores char value  tie(i_val ignore f_val) = tup1;    // Displaying unpacked tuple elements with ignore  cout << 'The unpacked tuple values (with ignore) are: ';  cout << i_val << ' ' << f_val;  cout << endl;  return 0; }

Produktion

The unpacked tuple values (without ignore) are: 20 g 17.5 The unpacked tuple values (with ignore) are: 20 17.5

6. tuple_cat (): Denne funktion sammenkæder to tuples og returnerer en ny tuple.

Spids vinkel

CPP

#include    #include  // for tuple_cat() and tuple using namespace std; int main() {  // Initializing 1st tuple  tuple<int char float> tup1(20 'g' 17.5);  // Initializing 2nd tuple  tuple<int char float> tup2(30 'f' 10.5);    // Concatenating 2 tuples to return a new tuple  auto tup3 = tuple_cat(tup1 tup2);    // Displaying new tuple elements  cout << 'The new tuple elements in order are: ';  cout << get<0>(tup3) << ' ' << get<1>(tup3) << ' '   << get<2>(tup3) << ' ' << get<3>(tup3) << ' '   << get<4>(tup3) << ' ' << get<5>(tup3) << endl;  return 0; }

Produktion

The new tuple elements in order are: 20 g 17.5 30 f 10.5

TechCodeview

Operationer på tuple