add within

bin/main.cpp

@@ -1,11 +1,17 @@
 #include <iostream>
 
 #include "string/string.hpp"
+#include "range/range.hpp"
 
 int main(int argc, char *argv[])
 {
+  {// ex: split_str
     std::string str { "asdf,qwer,zxcv" };
     hack::v_str v = hack::split_str(str, ',');
-
     for (const auto& c : v) std::cout << c << std::endl;
   }
+
+  {// ex: within
+    std::cout << hack::within(12, 34, 12, 23, 31) << std::endl;
+  }
+}

bin/meson.build

@@ -1,4 +1,5 @@
 deps += string_dep
+deps += range_dep
 
 executable(
   'hack', 'main.cpp', 

src/meson.build

@@ -1,3 +1,4 @@
 inc += include_directories('.')
 
 subdir('string')
+subdir('range')

src/range/meson.build

@@ -0,0 +1,14 @@
+headers = ['range.hpp']
+sources = ['range.cpp']
+
+lib = library(
+  'range',
+  include_directories : inc,
+  install : true,
+  sources: [headers, sources]
+)
+
+range_dep = declare_dependency(
+  include_directories: inc,
+  link_with: lib
+)

src/range/range.cpp

@@ -0,0 +1,5 @@
+#include "range.hpp"
+
+namespace hack
+{
+}

src/range/range.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+namespace hack
+{
+  template<typename T, typename... Args>
+  bool within(T min, T max, Args... args)
+  {
+    return ((min <= args && max >= args) && ...);
+    // 1, 5, 2, 3, 4
+    // ( (1 <= 2 && 5 >= 2) && (1 <= 3 && 5 >= 3) && (1 <= 4 && 5 >= 4) )
+  }
+}

tests/meson.build

@@ -5,7 +5,16 @@ test(
   'split_str',
   executable(
     'split_str',
-    'split_str.cpp',
+    'string.cpp',
     dependencies: [ string_dep, gtest_dep ]
   )
 )
+
+test(
+  'within',
+  executable(
+    'within',
+    'range.cpp',
+    dependencies: [ range_dep, gtest_dep ]
+  )
+)

tests/range.cpp

@@ -0,0 +1,9 @@
+#include <gtest/gtest.h>
+
+#include "range/range.hpp"
+
+TEST(within, check)
+{
+  ASSERT_EQ(hack::within(23, 123, 34, 44, 55, 66), true);
+  ASSERT_EQ(hack::within(23, 123, 134, 44, 55, 66), false);
+}