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                ## 優點 沒有頭文件 聲明實現仍然可分離, 但非必要 可以顯式指定那些導出(類, 函數等) 不需要頭文件重復引入宏 (include guards) 模塊之間名稱可以相同不會沖突 模塊只處理一次, 編譯更快 (頭文件每次引入都需要處理) 預處理宏只在模塊內有效 模塊引入順序無關緊要 創建模塊 ``` // cppcon.cpp export module cppcon; namespace CppCon { auto GetWelcomeHelper() { return "Welcome to CppCon 2019!"; } export auto GetWelcome() { return GetWelcomeHelper();} } 引用模塊 // main.cpp import cppcon; int main(){ std::cout << CppCon::GetWelcome(); } ``` import 頭文件 import 隱式地將 iostream 轉換為模塊 加速構建, 因為 iostream 只會處理一次 和預編譯頭 (PCH) 具有相似的效果
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