El bucle for basat en intervals en C++ s'ha afegit des de C++ 11. Executa un bucle for en un interval. S'utilitza com a equivalent més llegible al bucle for tradicional que funciona en un rang de valors, com ara tots els elements d'un contenidor.

  for ( range_declaration : range_expression )      loop_statement    Parameters :    range_declaration :   a declaration of a named variable, whose type is the  type of the element of the sequence represented by  range_expression, or a reference to that type. Often uses the auto specifier for automatic type  deduction.   range_expression :   any expression that represents a suitable sequence  or a braced-init-list.   loop_statement :   any statement, typically a compound statement, which is the body of the loop.>

Implementació C++:

Java regex $

// Illustration of range-for loop // using CPP code #include  #include  #include  #include  using namespace std; // Driver int main() {  // Iterating over whole array  vector v = {0, 1, 2, 3, 4, 5};  per (auto i : v) cout<< i << ' ';  cout << '
';  // the initializer may be a braced-init-list  for (int n : { 0, 1, 2, 3, 4, 5 })  cout << n << ' ';  cout << '
';  // Iterating over array  int a[] = { 0, 1, 2, 3, 4, 5 };  for (int n : a)  cout << n << ' ';  cout << '
';  // Just running a loop for every array  // element  for (int n : a)  cout << 'In loop' << ' ';  cout << '
';  // Printing string characters  string str = 'Geeks';  for (char c : str)  cout << c << ' ';  cout << '
';  // Printing keys and values of a map  map MAPA({ { 1, 1 }, { 2, 2 }, { 3, 3 } });  for (auto i : MAP) cout<< '{' << i.first << ', ' << i.second << '}
'; }>

0 1 2 3 4 5 0 1 2 3 4 5 0 1 2 3 4 5 In loop In loop In loop In loop In loop In loop G e e k s {1, 1} {2, 2} {3, 3}>

C++ 17 o superior: Els bucles basats en intervals també es poden utilitzar amb mapes com aquest:

for (auto& [key, value]: myMap) {  cout << key << ' has value ' << value << std::endl; }>

Aquí [clau, valor] funciona com a elements de parell al qual es pot accedir directament sense especificar la primera o la segona paraula clau.

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