Synopsis

(Required) A for-range-initializer shall contain at most one function call

Enabled by default

Yes

Severity/Certainty

Medium/High

Full description

Doing multiple calls may cause undefined behaviour regarding temporary object lifetime.

Coding standards

This check does not correspond to any coding standard rules.

Code examples

The following code example fails the check and will give a warning:

#include <vector>
#include <string>

extern std::vector < std::string > make();

void example() {
  for ( char c: make().at(0) ) {} // Non-compliant - two function calls
}

The following code example passes the check and will not give a warning about this issue:

#include <vector>
#include <string>

extern std::vector < std::string > make();

void example() {
  auto v = make(); 
  for ( char c: v.at(0) ) {} // Compliant
}