range-based-for-statement-cpp.md

description	title	ms.date	ms.assetid
Learn more about: Range-based for Statement (C++)	Range-based for Statement (C++)	11/04/2016	5750ba1d-ba48-4236-a923-e32de8345c2d

Range-based for Statement (C++)

Executes statement repeatedly and sequentially for each element in expression.

Syntax

for (for-range-declaration:expression)
  statement

Remarks

Use the range-based for statement to construct loops that must execute through a range, which is defined as anything that you can iterate through—for example, std::vector, or any other C++ Standard Library sequence whose range is defined by a begin() and end(). The name that is declared in the for-range-declaration portion is local to the for statement and cannot be re-declared in expression or statement. Note that the auto keyword is preferred in the for-range-declaration portion of the statement.

New in Visual Studio 2017: Range-based for loops no longer require that begin() and end() return objects of the same type. This enables end() to return a sentinel object such as used by ranges as defined in the Ranges-V3 proposal. For more information, see Generalizing the Range-Based For Loop and the range-v3 library on GitHub.

This code shows how to use range-based for loops to iterate through an array and a vector:

// range-based-for.cpp// compile by using: cl /EHsc /nologo /W4 #include<iostream> #include<vector>usingnamespacestd;intmain() { // Basic 10-element integer array.int x[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; // Range-based for loop to iterate through the array.for( int y : x ) { // Access by value using a copy declared as a specific type.// Not preferred. cout << y << ""; } cout << endl; // The auto keyword causes type inference to be used. Preferred.for( auto y : x ) { // Copy of 'x', almost always undesirable cout << y << ""; } cout << endl; for( auto &y : x ) { // Type inference by reference.// Observes and/or modifies in-place. Preferred when modify is needed. cout << y << ""; } cout << endl; for( constauto &y : x ) { // Type inference by const reference.// Observes in-place. Preferred when no modify is needed. cout << y << ""; } cout << endl; cout << "end of integer array test" << endl; cout << endl; // Create a vector object that contains 10 elements. vector<double> v; for (int i = 0; i < 10; ++i) { v.push_back(i + 0.14159); } // Range-based for loop to iterate through the vector, observing in-place.for( constauto &j : v ) { cout << j << ""; } cout << endl; cout << "end of vector test" << endl; }

Here is the output:

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 end of integer array test 0.14159 1.14159 2.14159 3.14159 4.14159 5.14159 6.14159 7.14159 8.14159 9.14159 end of vector test 

A range-based for loop terminates when one of these in statement is executed: a break, return, or goto to a labeled statement outside the range-based for loop. A continue statement in a range-based for loop terminates only the current iteration.

Keep in mind these facts about range-based for:

• Automatically recognizes arrays.

• Recognizes containers that have .begin() and .end().

• Uses argument-dependent lookup begin() and end() for anything else.

See also

auto
Iteration Statements
Keywords
while Statement (C++)
do-while Statement (C++)
for Statement (C++)