fix: build under gcc

.clang-format

@@ -152,5 +152,4 @@ SpacesInParentheses: false
 SpacesInSquareBrackets: false
 Standard:        Latest
 TabWidth:        4
-UseTab:          Never
-...
+UseTab:          Never

.clang-tidy

@@ -1,10 +1,14 @@
 ---
-Checks:          '*,-modernize-use-nodiscard'
+Checks:          '*,-modernize-use-nodiscard,-llvmlibc-*,-fuchsia-trailing-return,-fuchsia*,-altera-*'
 WarningsAsErrors: ''
 HeaderFilterRegex: ''
 AnalyzeTemporaryDtors: false
 FormatStyle:     file
 CheckOptions:
+  - key:             readability-braces-around-statements.ShortStatementLines
+    value:           '1'
+  - key:             hicpp-braces-around-statements.ShortStatementLines
+    value:           '1'
   - key:             bugprone-use-after-move
     value:           '1'
   - key:             bugprone-assert-side-effect.AssertMacros
@@ -40,5 +44,4 @@ CheckOptions:
   - key:             hicpp-special-member-functions.AllowMissingMoveFunctions
     value:           '0'
   - key:             hicpp-special-member-functions.AllowSoleDefaultDtor
-    value:           '0'
-...
+    value:           '0'

.vscode/settings.json

@@ -9,4 +9,5 @@
             }
         }
     ],
+    "editor.formatOnSave": true,
 }

CMakeLists.txt

@@ -27,8 +27,10 @@ list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/extras)
 include(CTest)
 include(Catch)
 
-set(CMAKE_C_COMPILER /opt/homebrew/Cellar/llvm@16/16.0.6/bin/clang)
-set(CMAKE_CXX_COMPILER /opt/homebrew/Cellar/llvm@16/16.0.6/bin/clang++)
+if(APPLE)
+  set(CMAKE_C_COMPILER /opt/homebrew/Cellar/llvm@16/16.0.6/bin/clang)
+  set(CMAKE_CXX_COMPILER /opt/homebrew/Cellar/llvm@16/16.0.6/bin/clang++)
+endif()
 
 SET(CALCULATOR_CHALLENGE_SOURCES
   Calculator.cpp

Calculator.cpp

@@ -1,5 +1,6 @@
 #include "Calculator.hpp"
 
+#include <cstdint>
 #include <ranges>
 #include <unordered_map>
 

Calculator.hpp

@@ -1,10 +1,9 @@
-#ifndef CALCULATOR_CHALLENGE_WORKSPACE_HPP
-#define CALCULATOR_CHALLENGE_WORKSPACE_HPP
+#ifndef CALCULATOR_CHALLENGE_CALCULATOR_HPP
+#define CALCULATOR_CHALLENGE_CALCULATOR_HPP
 
-#include <cstdint>
-#include <stack>
+#include <optional>
 #include <string>
-#include <unordered_map>
+#include <utility>
 #include <vector>
 
 #include "Operand.hpp"

CalculatorCli.cpp

@@ -27,7 +27,7 @@ struct OperationMembers
 };
 
 template<typename T>
-auto text_to_number(std::string_view text) noexcept
+auto text_to_number(std::string_view text) noexcept -> T
 {
     if (text.empty()) return T{};