first

.vscode/c_cpp_properties.json

@@ -0,0 +1,21 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "compilerPath": "C:\\cygwin64\\bin\\gcc.exe",
+            "cStandard": "gnu17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "linux-gcc-x64",
+            "compileCommands": "${workspaceFolder}/cmake_lib/build/compile_commands.json"
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

@@ -0,0 +1,10 @@
+{
+    "files.associations": {
+        "atomic": "cpp",
+        "*.tcc": "cpp",
+        "compare": "cpp",
+        "numeric": "cpp",
+        "cmath": "cpp",
+        "iostream": "cpp"
+    }
+}

cmake_usage/src/main.cpp

@@ -1,7 +1,7 @@
 #include <iostream>
 #include "add.h"
 #include "sub.h"
-
+using namespace std;
 int main (int, char **)
 {
     std::cout << "Hello, world!\n";