Adds deprecation warning and CMake support

Author: adeharo9

CMakeLists.txt

@@ -0,0 +1,22 @@
+#----------------------- PROJECT CONFIGURATION -------------------------
+cmake_minimum_required(VERSION 3.10)
+project(cpp-dotenv VERSION 0.1.0)
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+#----------------------- LIBRARY CONFIGURATION -------------------------
+
+set(CPP_DOTENV_LIB cpp_dotenv CACHE INTERNAL "")
+set(CPP_DOTENV_SRC
+    dotenv.h
+)
+
+add_library(${CPP_DOTENV_LIB} ${CPP_DOTENV_SRC})
+set_target_properties(${CPP_DOTENV_LIB} PROPERTIES
+    LINKER_LANGUAGE CXX
+)
+
+target_include_directories(${CPP_DOTENV_LIB} PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)

README.md

@@ -6,6 +6,14 @@ C++ implementation of nodejs [dotenv](https://github.com/motdotla/dotenv) projec
 
 **cpp-dotenv** is implemented as a single C++ header file, so there is no need to compile nor to add complex file dependencies to your project. Simply include the header file wherever you want to use it and ta-da!, you're done.
 
+## Table of contents
+
+1. [Dependencies](#dependencies)
+2. [Usage](#usage)
+   1. [CMake](#cmake)
+3. [Examples](#examples)
+4. [Grammar](#grammar)
+
 ## Dependencies
 
 **NONE**, for sure! :sunglasses: If it had, it wouldn't follow the basic dotenv principles.
@@ -32,6 +40,20 @@ Also for convenience, there is a namespace-global pre-loaded reference variable
 auto& dotenv = env; // 'auto' here is 'dotenv::dotenv'
 ```
 
+### CMake
+
+`cpp-dotenv` also comes with support for `CMake` right out of the box. In order to use it, simply include this repository's directory and link the `CPP_DOTENV_LIB` library to your own targets where needed:
+
+```cmake
+add_subdirectory(cpp-dotenv)
+
+...
+
+target_link_libraries(YOUR_TARGET PUBLIC ${CPP_DOTENV_LIB})
+```
+
+After this, you might use the library as described in [usage](#usage).
+
 ## Examples
 
 Assume the following `.env` file:

dotenv.h

@@ -366,7 +366,7 @@ namespace dotenv
 
     private:
 
-        const bool overwrite = false;
+        bool overwrite = false;
 
         char token;
         uint row_count;
@@ -465,6 +465,12 @@ namespace dotenv
             return *this;
         }
 
+        [[deprecated("Replaced by load_dotenv()")]]
+        inline dotenv& config(const std::string& full_path = env_filename)
+        {
+            return load_dotenv(full_path);
+        }
+
         inline const value_type operator[](const key_type& k) const
         {
             if (not _config) { throw std::logic_error(config_err); }