https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar
  • Sirisha Pratha 
public class org.eclipse.collections.impl.block.factory.Functions$SizeFunction extends org.eclipse.collections.impl.block.function.primitive.IntegerFunctionImpl<java.lang.Iterable<?>>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.eclipse.collections.impl.block.factory.Functions$SizeFunction
  super_class: org.eclipse.collections.impl.block.function.primitive.IntegerFunctionImpl
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.block.factory.Functions$SizeFunction this
         0: .line 833
            aload 0 /* this */
            invokespecial org.eclipse.collections.impl.block.function.primitive.IntegerFunctionImpl.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.block.factory.Functions$SizeFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/block/factory/Functions$SizeFunction;

  public int intValueOf(java.lang.Iterable<?>);
    descriptor: (Ljava/lang/Iterable;)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.block.factory.Functions$SizeFunction this
        start local 1 // java.lang.Iterable iterable
         0: .line 840
            aload 1 /* iterable */
            invokestatic org.eclipse.collections.impl.utility.Iterate.sizeOf:(Ljava/lang/Iterable;)I
            ireturn
        end local 1 // java.lang.Iterable iterable
        end local 0 // org.eclipse.collections.impl.block.factory.Functions$SizeFunction this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0      this  Lorg/eclipse/collections/impl/block/factory/Functions$SizeFunction;
            0    1     1  iterable  Ljava/lang/Iterable<*>;
    Signature: (Ljava/lang/Iterable<*>;)I
    MethodParameters:
          Name  Flags
      iterable  

  public int intValueOf(java.lang.Object);
    descriptor: (Ljava/lang/Object;)I
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Iterable
            invokevirtual org.eclipse.collections.impl.block.factory.Functions$SizeFunction.intValueOf:(Ljava/lang/Iterable;)I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lorg/eclipse/collections/impl/block/function/primitive/IntegerFunctionImpl<Ljava/lang/Iterable<*>;>;
SourceFile: "Functions.java"
NestHost: org.eclipse.collections.impl.block.factory.Functions
InnerClasses:
  public SizeFunction = org.eclipse.collections.impl.block.factory.Functions$SizeFunction of org.eclipse.collections.impl.block.factory.Functions