From 1d9a39f79293857542438650678e6b281437d2e8 Mon Sep 17 00:00:00 2001
From: peri4 <peri4ko@yandex.ru>
Date: Mon, 10 Jan 2022 17:10:41 +0300
Subject: [PATCH] piCompare

---
 libs/main/core/pibase.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libs/main/core/pibase.h b/libs/main/core/pibase.h
index 8c978f93..de83702b 100644
--- a/libs/main/core/pibase.h
+++ b/libs/main/core/pibase.h
@@ -31,6 +31,7 @@
 #include "pip_export.h"
 #include "pip_defs.h"
 #include "string.h"
+#include <limits>
 
 //! Meta-information section for any entity.
 //! Parsing by \a pip_cmg and can be accessed by \a PICodeInfo.
@@ -355,6 +356,17 @@ inline bool piCompareBinary(const void * f, const void * s, size_t size) {
 	return true;
 }
 
+/*! @brief Function for compare two numeric values with epsilon
+ * \details Example:\n \snippet piincludes.cpp compare
+* There are some macros:
+* - \c piComparef for "float"
+* - \c piCompared for "double"
+*/
+template<typename T>
+inline bool piCompare(const T & a, const T & b, const T & epsilon = std::numeric_limits<T>::epsilon()) {
+	return std::abs(a - b) <= epsilon;
+}
+
 /*! @brief Templated function return round of float falue
  * \details Round is the nearest integer value \n
  * There are some macros:
@@ -558,6 +570,8 @@ template<> inline uint piHash(const ldouble & v) {return piHashData((const uchar
 
 #define piRoundf piRound<float>
 #define piRoundd piRound<double>
+#define piComparef piCompare<float>
+#define piCompared piCompare<double>
 #define piFloorf piFloor<float>
 #define piFloord piFloor<double>
 #define piCeilf piCeil<float>