<![CDATA[Topics tagged with static]]>http://forum.d2learn.org/tags/staticRSS for NodeTue, 11 Aug 2026 11:34:59 GMTInvalid Date60<![CDATA[C++ 模块中静态全局变量的消失问题]]>错误例子（我写的）

module; #include "httplib.h" export module mcp.compat.httplib; export namespace mcp { using HttpClient = httplib::Client; using DataSink = httplib::DataSink; using Headers = httplib::Headers; using HttpRequest = httplib::Request; using HttpResponse = httplib::Response; using HttpServer = httplib::Server; #ifdef MCP_SSL using SslServer = httplib::SSLServer; #endif }

正确例子（官方库提供的）

module; /* * Headers */ #ifdef _WIN32 #ifndef _CRT_SECURE_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #endif //_CRT_SECURE_NO_WARNINGS #ifndef _CRT_NONSTDC_NO_DEPRECATE #define _CRT_NONSTDC_NO_DEPRECATE #endif //_CRT_NONSTDC_NO_DEPRECATE #if defined(_MSC_VER) #if _MSC_VER < 1900 #error Sorry, Visual Studio versions prior to 2015 are not supported #endif #pragma comment(lib, "ws2_32.lib") #ifndef _SSIZE_T_DEFINED #define _SSIZE_T_DEFINED #endif #endif // _MSC_VER #ifndef S_ISREG #define S_ISREG(m) (((m) & S_IFREG) == S_IFREG) #endif // S_ISREG #ifndef S_ISDIR #define S_ISDIR(m) (((m) & S_IFDIR) == S_IFDIR) #endif // S_ISDIR #ifndef NOMINMAX #define NOMINMAX #endif // NOMINMAX #include <io.h> #include <winsock2.h> #include <ws2tcpip.h> #if defined(__has_include) #if __has_include(<afunix.h>) // afunix.h uses types declared in winsock2.h, so has to be included after it. #include <afunix.h> #define CPPHTTPLIB_HAVE_AFUNIX_H 1 #endif #endif #ifndef WSA_FLAG_NO_HANDLE_INHERIT #define WSA_FLAG_NO_HANDLE_INHERIT 0x80 #endif #else // not _WIN32 #include <arpa/inet.h> #if !defined(_AIX) && !defined(__MVS__) #include <ifaddrs.h> #endif #ifdef __MVS__ #include <strings.h> #ifndef NI_MAXHOST #define NI_MAXHOST 1025 #endif #endif #include <net/if.h> #include <netdb.h> #include <netinet/in.h> #ifdef __linux__ #include <resolv.h> #undef _res // Undefine _res macro to avoid conflicts with user code (#2278) #endif #include <csignal> #include <netinet/tcp.h> #include <poll.h> #include <pthread.h> #include <sys/mman.h> #include <sys/socket.h> #include <sys/un.h> #include <unistd.h> #ifndef INVALID_SOCKET #define INVALID_SOCKET (-1) #endif #endif //_WIN32 #if defined(__APPLE__) #include <TargetConditionals.h> #endif #include <algorithm> #include <array> #include <atomic> #include <cassert> #include <cctype> #include <chrono> #include <climits> #include <condition_variable> #include <cstdlib> #include <cstring> #include <errno.h> #include <exception> #include <fcntl.h> #include <functional> #include <iomanip> #include <iostream> #include <list> #include <map> #include <memory> #include <mutex> #include <random> #include <regex> #include <set> #include <sstream> #include <string> #include <sys/stat.h> #include <system_error> #include <thread> #include <unordered_map> #include <unordered_set> #include <utility> #if defined(CPPHTTPLIB_USE_NON_BLOCKING_GETADDRINFO) || \ defined(CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN) #if TARGET_OS_MAC #include <CFNetwork/CFHost.h> #include <CoreFoundation/CoreFoundation.h> #endif #endif // CPPHTTPLIB_USE_NON_BLOCKING_GETADDRINFO or // CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN #ifdef CPPHTTPLIB_OPENSSL_SUPPORT #ifdef _WIN32 #include <wincrypt.h> // these are defined in wincrypt.h and it breaks compilation if BoringSSL is // used #undef X509_NAME #undef X509_CERT_PAIR #undef X509_EXTENSIONS #undef PKCS7_SIGNER_INFO #ifdef _MSC_VER #pragma comment(lib, "crypt32.lib") #endif #endif // _WIN32 #if defined(CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN) #if TARGET_OS_MAC #include <Security/Security.h> #endif #endif // CPPHTTPLIB_USE_NON_BLOCKING_GETADDRINFO #include <openssl/err.h> #include <openssl/evp.h> #include <openssl/ssl.h> #include <openssl/x509v3.h> #if defined(_WIN32) && defined(OPENSSL_USE_APPLINK) #include <openssl/applink.c> #endif #include <iostream> #include <sstream> #if defined(OPENSSL_IS_BORINGSSL) || defined(LIBRESSL_VERSION_NUMBER) #if OPENSSL_VERSION_NUMBER < 0x1010107f #error Please use OpenSSL or a current version of BoringSSL #endif #define SSL_get1_peer_certificate SSL_get_peer_certificate #elif OPENSSL_VERSION_NUMBER < 0x30000000L #error Sorry, OpenSSL versions prior to 3.0.0 are not supported #endif #endif // CPPHTTPLIB_OPENSSL_SUPPORT #ifdef CPPHTTPLIB_MBEDTLS_SUPPORT #include <mbedtls/ctr_drbg.h> #include <mbedtls/entropy.h> #include <mbedtls/error.h> #include <mbedtls/md5.h> #include <mbedtls/net_sockets.h> #include <mbedtls/oid.h> #include <mbedtls/pk.h> #include <mbedtls/sha1.h> #include <mbedtls/sha256.h> #include <mbedtls/sha512.h> #include <mbedtls/ssl.h> #include <mbedtls/x509_crt.h> #ifdef _WIN32 #include <wincrypt.h> #ifdef _MSC_VER #pragma comment(lib, "crypt32.lib") #endif #endif // _WIN32 #if defined(CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN) #if TARGET_OS_MAC #include <Security/Security.h> #endif #endif // CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN // Mbed TLS 3.x API compatibility #if MBEDTLS_VERSION_MAJOR >= 3 #define CPPHTTPLIB_MBEDTLS_V3 #endif #endif // CPPHTTPLIB_MBEDTLS_SUPPORT // Define CPPHTTPLIB_SSL_ENABLED if any SSL backend is available // This simplifies conditional compilation when adding new backends (e.g., // wolfSSL) #if defined(CPPHTTPLIB_OPENSSL_SUPPORT) || defined(CPPHTTPLIB_MBEDTLS_SUPPORT) #define CPPHTTPLIB_SSL_ENABLED #endif #ifdef CPPHTTPLIB_ZLIB_SUPPORT #include <zlib.h> #endif #ifdef CPPHTTPLIB_BROTLI_SUPPORT #include <brotli/decode.h> #include <brotli/encode.h> #endif #ifdef CPPHTTPLIB_ZSTD_SUPPORT #include <zstd.h> #endif export module httplib; export extern "C++" { #include "httplib.h" }

当你试图将一个非模块化的第三方库（尤其是像 httplib 这种带全局状态或初始化逻辑的库）封装进模块时：

不要尝试只导出部分类型：除非你非常确定该库没有全局初始化逻辑（Constructor static guards）。

使用 export extern "C++"：这是将传统头文件“模块化”的最标准、最稳妥做法。

环境对齐：在 module; 之后，务必把该库依赖的所有系统宏（如 _WIN32, WIN32_LEAN_AND_MEAN 等）都写清楚。

]]>http://forum.d2learn.org/topic/171/c-模块中静态全局变量的消失问题http://forum.d2learn.org/topic/171/c-模块中静态全局变量的消失问题Invalid Date