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Java 8+ functional interfaces for primitive types

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package com.github.tommyettinger.function;

/**
 * Represents an operation on a single {@code double}-valued operand that produces
 * a {@code char}-valued result.
 * 

 * This is a functional interface whose functional method is {@link #applyAsChar(double)}.
 */
@FunctionalInterface
public interface DoubleToCharFunction {
  /**
   * Applies this function to the given argument.
   *
   * @param value the function argument
   * @return the function result
   */
  char applyAsChar(double value);
}