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+//
+//  PureLayout+Internal.h
+//  https://github.com/PureLayout/PureLayout
+//
+//  Copyright (c) 2014-2015 Tyler Fox
+//
+//  This code is distributed under the terms and conditions of the MIT license.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to
+//  deal in the Software without restriction, including without limitation the
+//  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+//  IN THE SOFTWARE.
+//
+
+#import "PureLayoutDefines.h"
+
+
+// Using generics with NSMutableArray is so common in the internal implementation of PureLayout that it gets a dedicated preprocessor macro for better readability.
+#define PL__NSMutableArray_of(type)                   PL__GENERICS(NSMutableArray, type)
+
+PL__ASSUME_NONNULL_BEGIN
+
+/** A constant that represents the smallest valid positive value for the multiplier of a constraint,
+    since a value of 0 will cause the second item to be lost in the internal auto layout engine. */
+static const CGFloat kMULTIPLIER_MIN_VALUE = (CGFloat)0.00001; // very small floating point numbers (e.g. CGFLOAT_MIN) can cause problems
+
+
+/**
+ A category that exposes the internal (private) helper methods of the ALView+PureLayout category.
+ */
+@interface ALView (PureLayoutInternal)
+
+- (void)al_addConstraint:(NSLayoutConstraint *)constraint;
+- (ALView *)al_commonSuperviewWithView:(ALView *)otherView;
+- (NSLayoutConstraint *)al_alignAttribute:(ALAttribute)attribute toView:(ALView *)otherView forAxis:(ALAxis)axis;
+
+@end
+
+
+/**
+ A category that exposes the internal (private) helper methods of the NSArray+PureLayout category.
+ */
+@interface NSArray (PureLayoutInternal)
+
+- (ALView *)al_commonSuperviewOfViews;
+- (BOOL)al_containsMinimumNumberOfViews:(NSUInteger)minimumNumberOfViews;
+- (PL__NSArray_of(ALView *) *)al_copyViewsOnly;
+
+@end
+
+
+/**
+ A category that exposes the internal (private) helper methods of the NSLayoutConstraint+PureLayout category.
+ */
+@interface NSLayoutConstraint (PureLayoutInternal)
+
+ (BOOL)al_preventAutomaticConstraintInstallation;
+ (PL__NSMutableArray_of(NSLayoutConstraint *) *)al_currentArrayOfCreatedConstraints;
+ (BOOL)al_isExecutingPriorityConstraintsBlock;
+ (ALLayoutPriority)al_currentGlobalConstraintPriority;
+#if PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10
+ (nullable NSString *)al_currentGlobalConstraintIdentifier;
+#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10 */
+ (void)al_applyGlobalStateToConstraint:(NSLayoutConstraint *)constraint;
+ (NSLayoutAttribute)al_layoutAttributeForAttribute:(ALAttribute)attribute;
+ (ALLayoutConstraintAxis)al_constraintAxisForAxis:(ALAxis)axis;
+#if PL__PureLayout_MinBaseSDK_iOS_8_0
+ (ALMargin)al_marginForEdge:(ALEdge)edge;
+ (ALMarginAxis)al_marginAxisForAxis:(ALAxis)axis;
+#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 */
+
+@end
+
+PL__ASSUME_NONNULL_END