(原創) array傳進function該怎麼寫才好? (C/C++) (C)
由於C/C++不像C#可直接從array身上取得array size,導致C/C++ developer須自己處理array size,以下是常見的幾種寫法。
1.在陣列尾端放一個特別的marker代表結束。C-Style string就是用這種技巧,如以下寫法。
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#include <iostream>
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using namespace std;
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void func(char *pia) {
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while(*pia) {
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cout << *pia++ << endl;
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}
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}
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int main() {
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char ia[] = {'a', 'b', 'c', '\0'};
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func(ia);
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}
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2.將陣列第一個元素和最後一個元素傳進去,STL的algorithm就是使用這個技巧,如sort(svec.begin(), svec.end());
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/*
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(C) OOMusou 2007 http://oomusou.cnblogs.com
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Filename : ArrayPassToFunctionSTL.cpp
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Compiler : Visual C++ 8.0 / ISO C++
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Description : Demo how to use pass array to function by STL convention
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Release : 01/03/2007 1.0
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*/
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#include <iostream>
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using namespace std;
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void func(const int *beg, const int *end) {
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while(beg != end) {
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cout << *beg++ << endl;
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}
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}
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int main() {
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int ia[] = {0, 1, 2};
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func(ia, ia + 3);
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}
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3.傳統C語言的做法,將array size當成參數傳進去
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/*
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(C) OOMusou 2007 http://oomusou.cnblogs.com
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Filename : ArrayPassToFunctionCStyle.cpp
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Compiler : Visual C++ 8.0 / ISO C++
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Description : Demo how to use pass array to function by C Style
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Release : 01/03/2007 1.0
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*/
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#include <iostream>
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using namespace std;
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void func(int *pia, size_t arr_size) {
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for(size_t i = 0; i != arr_size; ++i) {
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cout << pia[i] << endl;
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}
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}
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int main() {
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int ia[] = {0, 1, 2};
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func(ia, 3);
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}
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4.使用function template + refference array
請參考(原創) 如何使用function template傳遞array? (C/C++) (template)
5.使用boost::array
請參考(原創) 如何使用boost::array? (C/C++) (boost)
(原創) 如何使用function template傳遞array? (C/C++) (template)
(原創) array傳進function該怎麼寫才好? (.NET) (C#)
(原創) 如何使用boost::array? (C/C++) (boost)
Reference
C++ Primer 4th P.242