问题描述
我正在学习在Xcode中编写C ++，我在Joe Pitt-Francis和Jonathan Whiteley的书中做这个例子。 C ++中的科学计算指南
I am learning to code C++ in Xcode, i am doing this example from the book by Joe Pitt-Francis and Jonathan Whiteley. "Guide to Scientific Computing in C++"
代码如下，
Book.ccp
#include "Book.hpp"
#include <iostream>
int main (int argc, char* argv[])
{
Book good_read;
good_read.author = "Lewis Carroll";
good_read.title = "Alice ";
good_read.publisher = "MA";
good_read.price = 199;
good_read.format = "hardback";
good_read.SetYearOfPublication(1787);
std::cout << "Year of publication of " << good_read.title << " is " << good_read.GetYearOfPublication() << "\n";
Book another_book(good_read);
Book an_extra_book ("the magic");
return 0;
}
Book.hpp
#ifndef book_Header_h
#define book_Header_h
#include <string>
class Book
{
public:
Book ();
Book (const Book& otherBook);
Book (std::string bookTitle);
std::string author, title, publisher, format;
int price;
void SetYearOfPublication (int year);
int GetYearOfPublication() const;
private:
int mYearOfPublication;
};
#endif
当我补充时，我得到了跟随错误。
When I complie, I got the follow error.
Undefined symbols for architecture x86_64:
"Book::SetYearOfPublication(int)", referenced from:
_main in Book.o
"Book::Book(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)", referenced from:
_main in Book.o
"Book::Book(Book const&)", referenced from:
_main in Book.o
"Book::Book()", referenced from:
_main in Book.o
"Book::GetYearOfPublication() const", referenced from:
_main in Book.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
在几个论坛上，它说，问题是Xcode不是编译所有的文件，但我不知道如何解决它，任何建议是非常欢迎。
In several forums it says that the issue is that Xcode is not compiling all the files, but I have no idea on how to solve it, any suggestion is more than welcome.
推荐答案
您在中声明函数 Book :: SetYearOfPublication（） > Book.hpp ，但是你永远不要定义它。你必须在一个实现文件中这样做：
You declare function Book::SetYearOfPublication() in Book.hpp, but you never define it. You have to do something like this in an implementation file:
void Book::SetYearOfPublication (int year) {
// TODO: add code for setting the publication year
}
这篇关于架构x86_64的未定义符号：Xcode 5问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！