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Posted to commits@commons.apache.org by er...@apache.org on 2018/05/19 15:13:49 UTC
[21/28] commons-numbers git commit: Method for retrieving the
identity element.
Method for retrieving the identity element.
Project: http://git-wip-us.apache.org/repos/asf/commons-numbers/repo
Commit: http://git-wip-us.apache.org/repos/asf/commons-numbers/commit/6ae5bc3a
Tree: http://git-wip-us.apache.org/repos/asf/commons-numbers/tree/6ae5bc3a
Diff: http://git-wip-us.apache.org/repos/asf/commons-numbers/diff/6ae5bc3a
Branch: refs/heads/master
Commit: 6ae5bc3a4bbd4e5075840cf4ee735424644e7d8d
Parents: d2ff5bf
Author: Gilles Sadowski <gi...@harfang.homelinux.org>
Authored: Mon Feb 5 01:57:13 2018 +0100
Committer: Gilles Sadowski <gi...@harfang.homelinux.org>
Committed: Mon Feb 5 01:57:13 2018 +0100
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.../main/java/org/apache/commons/numbers/core/Addition.java | 8 ++++++++
.../java/org/apache/commons/numbers/core/Multiplication.java | 8 ++++++++
2 files changed, 16 insertions(+)
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http://git-wip-us.apache.org/repos/asf/commons-numbers/blob/6ae5bc3a/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Addition.java
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diff --git a/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Addition.java b/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Addition.java
index 90ba67c..1e31979 100644
--- a/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Addition.java
+++ b/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Addition.java
@@ -31,6 +31,14 @@ public interface Addition<T> {
T add(T a);
/**
+ * Identity element.
+ *
+ * @return the field element such that for all {@code a},
+ * {@code zero().add(a).equals(a)} is {@code true}.
+ */
+ T zero();
+
+ /**
* Additive inverse.
*
* @return {@code -this}.
http://git-wip-us.apache.org/repos/asf/commons-numbers/blob/6ae5bc3a/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Multiplication.java
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diff --git a/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Multiplication.java b/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Multiplication.java
index 36fb6b0..e94ed86 100644
--- a/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Multiplication.java
+++ b/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Multiplication.java
@@ -31,6 +31,14 @@ public interface Multiplication<T> {
T multiply(T a);
/**
+ * Identity element.
+ *
+ * @return the field element such that for all {@code a},
+ * {@code one().multiply(a).equals(a)} is {@code true}.
+ */
+ T one();
+
+ /**
* Multiplicative inverse.
*
* @return <code>this<sup>-1</sup></code>.