From 2b5b89e9483063f3af05fb5485043868d447994b Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 7 Nov 2018 18:54:41 +0800
Subject: Add min max.

---
 src/base.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'src/base.h')

diff --git a/src/base.h b/src/base.h
index c8866cf6..9b3b50a1 100644
--- a/src/base.h
+++ b/src/base.h
@@ -10,6 +10,7 @@
 #include <memory>
 #include <string_view>
 #include <chrono>
+#include <optional>
 
 namespace cru
 {
@@ -63,4 +64,31 @@ namespace cru
         if (!condition)
             throw std::invalid_argument(error_message.data());
     }
+
+    template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+    float Coerce(const T n, const std::optional<T> min, const std::optional<T> max)
+    {
+        if (min.has_value() && n < min.value())
+            return min.value();
+        if (max.has_value() && n > max.value())
+            return max.value();
+        return n;
+    }
+
+    template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+    float Coerce(const T n, const std::nullopt_t, const std::optional<T> max)
+    {
+        if (max.has_value() && n > max.value())
+            return max.value();
+        return n;
+    }
+
+    template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
+    float Coerce(const T n, const std::optional<T> min, const std::nullopt_t)
+    {
+        if (min.has_value() && n < min.value())
+            return min.value();
+        return n;
+    }
+
 }
-- 
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