Why am I getting a "unidentified reference to 'dateType::dateType()'?

Question

Here's the fulll error message:

/usr/bin/ld: /tmp/cc3eosgO.o: in function `main':
main.cpp:(.text+0x2a): undefined reference to `dateType::dateType()'
/usr/bin/ld: main.cpp:(.text+0x48): undefined reference to `dateType::dateType(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0x66): undefined reference to `dateType::dateType(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0x75): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0xac): undefined reference to `dateType::setDate(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0xbb): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0xf2): undefined reference to `dateType::setDate(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0x101): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x138): undefined reference to `dateType::setDate(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0x147): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x17e): undefined reference to `dateType::setDate(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0x18d): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x1b5): undefined reference to `dateType::incrementDate()'
/usr/bin/ld: main.cpp:(.text+0x1c4): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x1ec): undefined reference to `dateType::incrementDate()'
/usr/bin/ld: main.cpp:(.text+0x1fb): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x232): undefined reference to `dateType::setDate(int, int, int)'
/usr/bin/ld: main.cpp:(.text+0x241): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x269): undefined reference to `dateType::incrementDate()'
/usr/bin/ld: main.cpp:(.text+0x278): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x2a0): undefined reference to `dateType::printDashDate() const'
/usr/bin/ld: main.cpp:(.text+0x2c8): undefined reference to `dateType::printTextDate() const'
/usr/bin/ld: main.cpp:(.text+0x2f0): undefined reference to `dateType::printLongTextDate() const'
/usr/bin/ld: main.cpp:(.text+0x318): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x340): undefined reference to `dateType::decrementDate()'
/usr/bin/ld: main.cpp:(.text+0x34f): undefined reference to `dateType::printSlashDate() const'
/usr/bin/ld: main.cpp:(.text+0x39d): undefined reference to `dateType::equalDate(dateType const&) const'
/usr/bin/ld: main.cpp:(.text+0x403): undefined reference to `dateType::dayOfWeek[abi:cxx11]() const'
/usr/bin/ld: main.cpp:(.text+0x44a): undefined reference to `dateType::~dateType()'
/usr/bin/ld: main.cpp:(.text+0x459): undefined reference to `dateType::~dateType()'
/usr/bin/ld: main.cpp:(.text+0x468): undefined reference to `dateType::~dateType()'
/usr/bin/ld: main.cpp:(.text+0x4ad): undefined reference to `dateType::~dateType()'
/usr/bin/ld: main.cpp:(.text+0x4c5): undefined reference to `dateType::~dateType()'
/usr/bin/ld: /tmp/cc3eosgO.o:main.cpp:(.text+0x4dd): more undefined references to `dateType::~dateType()' follow
collect2: error: ld returned 1 exit status

I don't understand. I'm using a coding class for one of my assignments.

Answer 1

Probably you have a dateType class declaration in a header file, but you do not have the implementation in any cpp file.

Is it your own type or does it come from some 3rd party library?

Comments

It's my own type

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So you're probably missing the implementation. Implementations, to be exact as there are many functions that are unresolved based on the error messages.

If you need further help, please, share your code.