From 603dacf69e902ec12f1b0ee4fede848f23e7f7e0 Mon Sep 17 00:00:00 2001
From: Nahuel Gaitan <45178494+N4gtan@users.noreply.github.com>
Date: Thu, 1 Jan 2026 22:21:38 -0300
Subject: [PATCH 1/2] add <fstream> to dynamic headers

---
 README.md                  | 2 ++
 include/ghc/fs_std.hpp     | 1 +
 include/ghc/fs_std_fwd.hpp | 1 +
 3 files changed, 4 insertions(+)

diff --git a/README.md b/README.md
index f510042..4ecb61e 100644
--- a/README.md
+++ b/README.md
@@ -239,6 +239,7 @@ you might use:
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;
@@ -318,6 +319,7 @@ switching like this:
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;
diff --git a/include/ghc/fs_std.hpp b/include/ghc/fs_std.hpp
index f09eeec..9eb38ac 100644
--- a/include/ghc/fs_std.hpp
+++ b/include/ghc/fs_std.hpp
@@ -58,6 +58,7 @@
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;
diff --git a/include/ghc/fs_std_fwd.hpp b/include/ghc/fs_std_fwd.hpp
index 372470f..3114d75 100644
--- a/include/ghc/fs_std_fwd.hpp
+++ b/include/ghc/fs_std_fwd.hpp
@@ -60,6 +60,7 @@
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;

From cdbf7835b4cc1d54a78b57a9ba25e00c87a078af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Steffen=20Schu=CC=88mann?= <s.schuemann@pobox.com>
Date: Sat, 11 Jul 2026 21:22:17 +0200
Subject: [PATCH 2/2] Add tests <fstream> addition and update CMake

---
 test/CMakeLists.txt             |  8 ++++++++
 test/fs_std_fwd_header_test.cpp |  8 ++++++++
 test/fs_std_header_test.cpp     | 10 ++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 test/fs_std_fwd_header_test.cpp
 create mode 100644 test/fs_std_header_test.cpp

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 1401ef0..5364435 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -97,6 +97,14 @@ if(CMAKE_CXX_COMPILER_ID MATCHES MSVC)
 endif()
 add_test(fwd_impl_test fwd_impl_test)
 
+if("cxx_std_17" IN_LIST GHC_FILESYSTEM_TEST_COMPILE_FEATURES)
+    add_executable(fs_std_header_test fs_std_header_test.cpp fs_std_fwd_header_test.cpp)
+    target_link_libraries(fs_std_header_test ghc_filesystem)
+    target_compile_features(fs_std_header_test PRIVATE cxx_std_17)
+    SetTestCompileOptions(fs_std_header_test)
+    add_test(fs_std_header_test fs_std_header_test)
+endif()
+
 add_executable(exception exception.cpp)
 if(NOT MSVC)
     target_compile_options(exception PRIVATE -fno-exceptions)
diff --git a/test/fs_std_fwd_header_test.cpp b/test/fs_std_fwd_header_test.cpp
new file mode 100644
index 0000000..132d0ea
--- /dev/null
+++ b/test/fs_std_fwd_header_test.cpp
@@ -0,0 +1,8 @@
+#define GHC_USE_STD_FS
+#include <ghc/fs_std_fwd.hpp>
+
+bool fs_std_fwd_header_test()
+{
+    fs::fstream stream;
+    return stream.is_open();
+}
diff --git a/test/fs_std_header_test.cpp b/test/fs_std_header_test.cpp
new file mode 100644
index 0000000..52b9ba8
--- /dev/null
+++ b/test/fs_std_header_test.cpp
@@ -0,0 +1,10 @@
+#define GHC_USE_STD_FS
+#include <ghc/fs_std.hpp>
+
+bool fs_std_fwd_header_test();
+
+int main()
+{
+    fs::ifstream stream;
+    return stream.is_open() || fs_std_fwd_header_test() ? 1 : 0;
+}