replace boost filesystem with std filesystem; upgrade gtest and find it using cmake.

examples/book_client/book_client.cc

@@ -3,7 +3,6 @@
 #include <iostream>
 
 #include "boost/algorithm/string/predicate.hpp"
-#include "boost/filesystem/operations.hpp"
 #include "json/json.h"
 
 #include "book_json.h"
@@ -125,7 +124,8 @@ bool BookClient::Delete(const std::string& id) {
   }
 }
 
-bool BookClient::GetPhoto(const std::string& id, const bfs::path& path) {
+bool BookClient::GetPhoto(const std::string& id,
+                          const std::filesystem::path& path) {
   try {
     auto r = session_.Send(WEBCC_GET(url_).
                            Path("books").Path(id).Path("photo")(),
@@ -145,7 +145,8 @@ bool BookClient::GetPhoto(const std::string& id, const bfs::path& path) {
   }
 }
 
-bool BookClient::SetPhoto(const std::string& id, const bfs::path& path) {
+bool BookClient::SetPhoto(const std::string& id,
+                          const std::filesystem::path& path) {
   try {
     if (!CheckPhoto(path)) {
       return false;
@@ -167,12 +168,13 @@ bool BookClient::SetPhoto(const std::string& id, const bfs::path& path) {
   }
 }
 
-bool BookClient::CheckPhoto(const bfs::path& photo) {
+bool BookClient::CheckPhoto(const std::filesystem::path& photo) {
   if (photo.empty()) {
     return false;
   }
 
-  if (!bfs::is_regular_file(photo) || !bfs::exists(photo)) {
+  if (!std::filesystem::is_regular_file(photo) ||
+      !std::filesystem::exists(photo)) {
     return false;
   }
 

examples/book_client/book_client.h

@@ -1,6 +1,7 @@
 #ifndef BOOK_CLIENT_H_
 #define BOOK_CLIENT_H_
 
+#include <filesystem>
 #include <list>
 #include <string>
 
@@ -11,8 +12,6 @@
 
 #include "book.h"
 
-namespace bfs = boost::filesystem;
-
 class BookClient {
 public:
   explicit BookClient(const std::string& url, int timeout = 0);
@@ -30,13 +29,13 @@ public:
   bool Delete(const std::string& id);
 
   // Get photo, save to the given path.
-  bool GetPhoto(const std::string& id, const bfs::path& path);
+  bool GetPhoto(const std::string& id, const std::filesystem::path& path);
 
   // Set photo using the file of the given path.
-  bool SetPhoto(const std::string& id, const bfs::path& path);
+  bool SetPhoto(const std::string& id, const std::filesystem::path& path);
 
 private:
-  bool CheckPhoto(const bfs::path& photo);
+  bool CheckPhoto(const std::filesystem::path& photo);
 
   // Check HTTP response status.
   bool CheckStatus(webcc::ResponsePtr response, int expected_status);

examples/book_client/main.cc

@@ -1,6 +1,6 @@
+#include <filesystem>
 #include <iostream>
 
-#include "boost/filesystem/operations.hpp"
 #include "webcc/logger.h"
 
 #include "book_client.h"
@@ -45,8 +45,9 @@ int main(int argc, char* argv[]) {
 
   std::string url = argv[1];
 
-  bfs::path photo_dir = argv[2];
-  if (!bfs::is_directory(photo_dir) || !bfs::exists(photo_dir)) {
+  std::filesystem::path photo_dir = argv[2];
+  if (!std::filesystem::is_directory(photo_dir) ||
+      !std::filesystem::exists(photo_dir)) {
     std::cerr << "Invalid photo dir!" << std::endl;
     return 1;
   }