Add comparable example

Author: gammasoft71

examples/xtd.core.examples/README.md

@@ -48,7 +48,8 @@
 
 ## [Concepts](concepts/README.md)
 
-* [is_stringable](concepts/stringable/README.md) shows how to use how to use [xtd::stringable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1stringable.html) concept.
+* [comparable](concepts/comparable/README.md) shows how to use how to use [xtd::comparable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1comparable.html) concept.
+* [stringable](concepts/stringable/README.md) shows how to use how to use [xtd::stringable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1stringable.html) concept.
 
 ## [Configuration](configuration/README.md)
 

examples/xtd.core.examples/concepts/CMakeLists.txt

@@ -4,6 +4,7 @@ project(concepts)
 find_package(xtd REQUIRED)
 
 add_projects(
+  comparable
   stringable
 )
 

examples/xtd.core.examples/concepts/README.md

@@ -2,6 +2,7 @@
 
 [This folder](.) contains guid examples used by [Reference Guide](https://gammasoft71.github.io/xtd/reference_guides/latest/) and more.
 
+* [comparable](comparable/README.md) shows how to use how to use [xtd::comparable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1comparable.html) concept.
 * [stringable](stringable/README.md) shows how to use how to use [xtd::stringable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1stringable.html) concept.
 
 ## Build and run any project

examples/xtd.core.examples/concepts/comparable/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.20)
+
+project(comparable)
+find_package(xtd REQUIRED)
+add_sources(README.md src/comparable.cpp)
+target_type(CONSOLE_APPLICATION)

examples/xtd.core.examples/concepts/comparable/README.md

@@ -0,0 +1,25 @@
+# comparable
+
+Shows how to use [xtd::comparable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1comparable.html) concept.
+
+## Sources
+
+* [src/comparable.cpp](src/comparable.cpp)
+* [CMakeLists.txt](CMakeLists.txt)
+
+## Build and run
+
+Open "Command Prompt" or "Terminal". Navigate to the folder that contains the project and type the following:
+
+```cmake
+xtdc run
+```
+
+## Output
+
+```
+max = 42
+max = 62.8
+min = 1.2.3
+min = 00:00:04.1220000
+```

examples/xtd.core.examples/concepts/comparable/src/comparable.cpp

@@ -0,0 +1,18 @@
+#include <xtd/xtd>
+
+auto get_max(const comparable auto& a, const comparable auto& b) {return a > b ? a : b;}
+auto get_min(const comparable auto& a, const comparable auto& b) {return a < b ? a : b;}
+
+auto main() -> int {
+  println("max = {}", get_max(42, 21));
+  println("max = {}", get_max(34.5, 62.8));
+  println("min = {}", get_min(version {1, 2, 4}, version {1, 2, 3}));
+  println("min = {}", get_min(4_s + 122_ms, 12_s + 234_ms));
+}
+
+// This code produces the following output :
+//
+// max = 42
+// max = 62.8
+// min = 1.2.3
+// min = 00:00:04.1220000

examples/xtd.core.examples/concepts/stringable/README.md

@@ -1,6 +1,6 @@
 # stringable
 
-Shows how to use [xtd::stringable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1istringable.html) concept.
+Shows how to use [xtd::stringable](https://gammasoft71.github.io/xtd/reference_guides/latest/classxtd_1_1stringable.html) concept.
 
 ## Sources