templates to be defined explicitly

[danicpp]

Do we need to define templates explicitly for each function/class

like

template<class X>
myfun1(X x){}

template<class X>
myfun2(X x){}

template<class X>
class myclass1{ X x; };

template<class X>
class myclass2{ X x; };

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OR could we define template once and start using it repeatedly
like

template<class X>

myfun1(X x){}
myfun2(X x){}
class myclass1{ X x; };
class myclass2{ X x; };