[問題] C++ template 宣告和函數分開寫

看板C_and_CPP作者hjmeric (Jimmy)時間12年前 (2013/05/16 21:45)推噓1(1推 0噓 22→)

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開發平台(Platform): (Ex: VC++, GCC, Linux, ...) g++ linux 額外使用到的函數庫(Library Used): (Ex: OpenGL, ...) 問題(Question) *[m 在myprint.hpp裡面宣告函數型態 template <class T> myprint..., 在myprint.cpp裡面定義函數, test_mypint.cpp裡面用main呼叫myprit， compile時找不到函數。餵入的資料(Input)：沒有預期的正確結果(Expected Output)：錯誤結果(Wrong Output)： /tmp/cc3Zk2SY.o: In function `main': test_myprint.cpp:(.text+0x63): undefined reference to `void myprint<double>(double*, int, char*)' collect2: ld returned 1 exit status 程式碼(Code)：(請善用置底文網頁, 記得排版) =================myprint.hpp========================== template <class T> void myprint(T *b, int n , char file_name[]); ====================================================== =================myprint.cpp========================== #include <iostream> #include <fstream> #include <cassert> #include "myprint.hpp" using namespace std; template <class T> void myprint(T *b, int n , char file_name[]){ int i ; ofstream myfile; myfile.open (file_name); assert(myfile.is_open()); for (i =0 ;i<n;i++) myfile << b[i] << endl; myfile.close(); return ; } ======================================================= ==================main.cpp============================= #include <cstdlib> #include "myprint.hpp" int main(){ char my_name [80] = "test_print_name.txt"; double *b = (double*)malloc(sizeof(double)*10); myprint<double>(b, 10 , my_name); free(b); return 0; } ======================================================== ===============command ================================= g++ myprint.cpp test_myprint.cpp ======================================================== 補充說明(Supplement)：我找到的資料是有說template不能分開寫，但是我不太懂是指什麼不能分開寫。謝謝大家。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.51.116 ※ 編輯: hjmeric 來自: 140.112.51.116 (05/16 21:47)

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