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Functions is one of the source-code metrics Understand computes across 17+ languages — browse them in the GUI, export and track them, or script them with the Python API.

Metrics overview

Functions

API ID: CountDeclFunction
Languages: Assembly, C#, C++, Java, Python, Rust, Web
Targets: Architectures, Files, Project

Number of functions.

Combines free functions and member functions (methods) into one count, and only counts ones that are actually defined, not just declared.

For example:


class SayHello {
public:
  SayHello() {}
  void printHello();
};

int i,j;
void SayHello::printHello() {
  switch (i) {
    case 0:
      cout << "Hello World" << endl;
    case 1:
      cout << "HELLO WORLD!" << endl;
    default: // a comment here
      for (int m = 0; m < j; m++);
      cout << "hello world" << endl;
  }
#ifdef A_VERY_NICE_VARIABLE

  cout << "Inactive Line" << endl; // Inactive
#endif

}

void cyclomaticDemo() {
  bool a = true, b = true, c = true;

  if (a || (b && c)) {
    while (a ? b : c) {
      for (int i = 0; i < 10; i++) {
        switch(i) {
          case 1:
          case 2:
            cout<<i<<endl;
            break;
          case 5:
            break;
          default:
            cout <<i<<endl;
        }
      }
    }
  } else {
    try {
      do {
        cout << a << b << c << endl;
      } while(a);
    }
    catch(...){

    }
  }
}


int func();
int main() {
  for (int i = 0;
       i < 10;
       i++)
    ;

  int j = func();
  int k = 0;
  int l = 1;

  int m
    = func();
  int n;
  n = 1;

#ifdef A_VERY_NICE_VARIABLE

  int j = 0;
  cout << j << endl;
#endif

  return 0;
}

sample.cpp defines 4 functions: the SayHello() constructor and SayHello::printHello() (methods), plus the free functions cyclomaticDemo() and main() — so CountDeclFunction = 4. func() is only declared, never defined in this file, so it doesn't count.

See Classes for the equivalent count of class-like declarations, and Subprograms for the same concept in Ada, Basic, Fortran, Jovial, and Pascal, which use that term instead.

Targets By Language: Configuration: