text: //
  //  RACBlockTrampoline.m
  //  ReactiveCocoa
  //
  //  Created by Josh Abernathy on 10/21/12.
  //  Copyright (c) 2012 GitHub, Inc. All rights reserved.
  //
  
  #import "RACBlockTrampoline.h"
  #import "RACTuple.h"
  
  @interface RACBlockTrampoline ()
  @property (nonatomic, readonly, copy) id block;
  @end
  
  @implementation RACBlockTrampoline
  
  #pragma mark API
  
  - (id)initWithBlock:(id)block {
  	self = [super init];
  	if (self == nil) return nil;
  
  	_block = [block copy];
  
  	return self;
  }
  
  + (id)invokeBlock:(id)block withArguments:(RACTuple *)arguments {
  	NSCParameterAssert(block != NULL);
  
  	RACBlockTrampoline *trampoline = [[self alloc] initWithBlock:block];
  	return [trampoline invokeWithArguments:arguments];
  }
  
  - (id)invokeWithArguments:(RACTuple *)arguments {
  	SEL selector = [self selectorForArgumentCount:arguments.count];
  	NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:selector]];
  	invocation.selector = selector;
  	invocation.target = self;
  
  	for (NSUInteger i = 0; i < arguments.count; i++) {
  		id arg = arguments[i];
  		NSInteger argIndex = (NSInteger)(i + 2);
  		[invocation setArgument:&arg atIndex:argIndex];
  	}
  
  	[invocation invoke];
  	
  	__unsafe_unretained id returnVal;
  	[invocation getReturnValue:&returnVal];
  	return returnVal;
  }
  
  - (SEL)selectorForArgumentCount:(NSUInteger)count {
  	NSCParameterAssert(count > 0);
  
  	switch (count) {
  		case 0: return NULL;
  		case 1: return @selector(performWith:);
  		case 2: return @selector(performWith::);
  		case 3: return @selector(performWith:::);
  		case 4: return @selector(performWith::::);
  		case 5: return @selector(performWith:::::);
  		case 6: return @selector(performWith::::::);
  		case 7: return @selector(performWith:::::::);
  		case 8: return @selector(performWith::::::::);
  		case 9: return @selector(performWith:::::::::);
  		case 10: return @selector(performWith::::::::::);
  		case 11: return @selector(performWith:::::::::::);
  		case 12: return @selector(performWith::::::::::::);
  		case 13: return @selector(performWith:::::::::::::);
  		case 14: return @selector(performWith::::::::::::::);
  		case 15: return @selector(performWith:::::::::::::::);
  	}
  
  	NSCAssert(NO, @"The argument count is too damn high! Only blocks of up to 15 arguments are currently supported.");
  	return NULL;
  }
  
  - (id)performWith:(id)obj1 {
  	id (^block)(id) = self.block;
  	return block(obj1);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 {
  	id (^block)(id, id) = self.block;
  	return block(obj1, obj2);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 {
  	id (^block)(id, id, id) = self.block;
  	return block(obj1, obj2, obj3);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 {
  	id (^block)(id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 {
  	id (^block)(id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 {
  	id (^block)(id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 {
  	id (^block)(id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 {
  	id (^block)(id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 {
  	id (^block)(id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 :(id)obj10 {
  	id (^block)(id, id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 :(id)obj10 :(id)obj11 {
  	id (^block)(id, id, id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 :(id)obj10 :(id)obj11 :(id)obj12 {
  	id (^block)(id, id, id, id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11, obj12);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 :(id)obj10 :(id)obj11 :(id)obj12 :(id)obj13 {
  	id (^block)(id, id, id, id, id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11, obj12, obj13);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 :(id)obj10 :(id)obj11 :(id)obj12 :(id)obj13 :(id)obj14 {
  	id (^block)(id, id, id, id, id, id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11, obj12, obj13, obj14);
  }
  
  - (id)performWith:(id)obj1 :(id)obj2 :(id)obj3 :(id)obj4 :(id)obj5 :(id)obj6 :(id)obj7 :(id)obj8 :(id)obj9 :(id)obj10 :(id)obj11 :(id)obj12 :(id)obj13 :(id)obj14 :(id)obj15 {
  	id (^block)(id, id, id, id, id, id, id, id, id, id, id, id, id, id, id) = self.block;
  	return block(obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11, obj12, obj13, obj14, obj15);
  }
  
  @end
  