From 7ec159ac5f983cc2b1d81dc6627ec4bb72d9e3a1 Mon Sep 17 00:00:00 2001
From: chatlanin <zimin@chatlanin.com.ru>
Date: Wed, 29 Jun 2022 12:36:48 +0300
Subject: [PATCH] add is_string security

---
 bin/main.cpp               | 11 +++++++++++
 src/range/range.hpp        |  1 +
 src/security/is_string.hpp | 14 ++++++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 src/security/is_string.hpp

diff --git a/bin/main.cpp b/bin/main.cpp
index c3d2dbb..ace7fc2 100644
--- a/bin/main.cpp
+++ b/bin/main.cpp
@@ -17,6 +17,7 @@
 #include "utils/utils.hpp"
 #include "security/validate_email.hpp"
 #include "security/generate_uuid.hpp"
+#include "security/is_string.hpp"
 
 // for example
 int f(int a)
@@ -200,4 +201,14 @@ int main(int argc, char *argv[])
     // ec: security::generate_uuid
     hack::log()(hack::security::generate_uuid());
   }
+
+  {
+    // ec: security::is_string
+    std::string s {"test"};
+    hack::log()(hack::security::is_string<decltype ("test_string")>::value);
+    hack::log()(hack::security::is_string<decltype (s)>::value);
+    hack::log()(hack::security::is_string<decltype (123)>::value);
+    hack::log()(hack::security::is_string<decltype ('c')>::value);
+    hack::log()(hack::security::is_string<decltype ("c")>::value);
+  }
 }
diff --git a/src/range/range.hpp b/src/range/range.hpp
index 662a2b1..5ef9e4c 100644
--- a/src/range/range.hpp
+++ b/src/range/range.hpp
@@ -2,6 +2,7 @@
 
 namespace hack::range
 {
+  // являются ли числа максимум и минимум последовательности
   template<typename T, typename... Args>
   bool within(const T min, const T max, Args... args)
   {
diff --git a/src/security/is_string.hpp b/src/security/is_string.hpp
new file mode 100644
index 0000000..713f397
--- /dev/null
+++ b/src/security/is_string.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+#include <variant>
+#include <type_traits>
+
+namespace hack::security
+{
+  template<typename T>
+  struct is_string : public std::disjunction<
+                  std::is_same<char*, typename std::decay_t<T>>,
+                  std::is_same<const char*, typename std::decay_t<T>>,
+                  std::is_same<std::string, typename std::decay_t<T>>> {};
+}