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POBuild Error:Undefined symbols for architecture x86_64:
 

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  1. POBuild Error:Undefined symbols for architecture x86_64:
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    <p>I am completely new in programming with c++ using the Xcode IDE. What I do is I created a Hashtable myself, and clicked the build button, and I got compilation errors as such. Does anyone have ideas about what is going wrong?</p> <p>This is the error:</p> <pre><code> Undefined symbols for architecture x86_64: "MyHashtable&lt;std::string, int&gt;::MyHashtable(int)", referenced from: _main in main.o "MyHashtable&lt;std::string, int&gt;::Insert(std::string, int)", referenced from: _main in main.o "MyHashtable&lt;std::string, int&gt;::GetKeys()", referenced from: _main in main.o "MyHashtable&lt;std::string, int&gt;::GetLength()", referenced from: _main in main.o "MyHashtable&lt;std::string, int&gt;::GetValue(std::string)", referenced from: _main in main.o "MyHashtable&lt;std::string, int&gt;::~MyHashtable()", referenced from: _main in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) </code></pre> <p>The cpp file of hashtable is as such:</p> <pre><code>#include &lt;iostream&gt; #include "Hashtable.h" #include &lt;string&gt; template&lt;typename T1,typename T2&gt; MyHashtable&lt;T1,T2&gt;::MyHashtable(int iSlots) { if(iSlots&lt;5) iSlots = 5; m_hashSlots = new HashElement&lt;T1,T2&gt;*[iSlots]; m_hashSlots = iSlots; m_Length = 0; } template&lt;typename T1,typename T2&gt; MyHashtable&lt;T1,T2&gt;::~MyHashtable() { if(m_hashSlots) { HashElement&lt;T1, T2&gt; * phead; for(int i = 0;i&lt;m_NumSlots;i++) { phead = m_hashSlots[i]; while(phead!=0) { HashElement&lt;T1, T2&gt;* pNext = phead-&gt;next; delete phead; phead = pNext; } } delete m_hashSlots; m_hashSlots = 0; } } template&lt;typename T1,typename T2&gt; int MyHashtable&lt;T1,T2&gt;::HashKey(T1 key) { char* keyString = (char*)key; int keyNum = 0; for(int i = 0;i&lt;strlen(keyString);i++) { int ascK = keyString[i]; keyNum += ascK; } return keyNum%m_NumSlots; } template&lt;typename T1,typename T2&gt; T1* MyHashtable&lt;T1,T2&gt;::GetKeys() { T1* keys = new T1[m_Length]; int index = 0; for(int i = 0;i&lt;m_NumSlots;i++) { HashElement&lt;T1,T2&gt; *phead = m_hashSlots[i]; while(phead!=0) { keys[index] = phead-&gt;key; index++; phead = phead-&gt;next; } } return keys; } template&lt;typename T1,typename T2&gt; T2 MyHashtable&lt;T1,T2&gt;::GetValue(T1 key) { int index = HashKey(key); HashElement&lt;T1,T2&gt; *phead = m_hashSlots[index]; while(phead) { if(phead-&gt;key==key) return phead-&gt;value; else phead = phead-&gt;next; } return NULL; } template&lt;typename T1,typename T2&gt; int MyHashtable&lt;T1,T2&gt;::GetLength() { return m_Length; } template&lt;typename T1,typename T2&gt; bool MyHashtable&lt;T1,T2&gt;::Insert(T1 key, T2 value) { int index = HashKey(key); HashElement&lt;T1,T2&gt; *phead = m_hashSlots[index]; while(phead) { if(phead-&gt;key == key) { int newValue = (int)(phead-&gt;value); newValue += int(value); return true; } else { phead = phead-&gt;next; } } HashElement&lt;T1,T2&gt;* newNode = new HashElement&lt;T1,T2&gt;(); newNode-&gt;key = key; newNode-&gt;value = value; phead-&gt;next = newNode; return true; } </code></pre>
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    1. PO
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    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USfaz
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POBuild Error:Undefined symbols for architecture x86_64:
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    1. This table or related slice is empty.
 

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