empty_source.cpp

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#ifndef Om_Source_EmptySource_
 
    #include "om/source/empty_source.hpp"
 
#else
 
// MARK: - Om::Source::EmptySource
 
    #define Template_ \
    template <typename ThisItem>
 
    #define Type_ \
    Om::Source::EmptySource<ThisItem>
 
// MARK: public (static)
 
Template_
inline Type_ & Type_::Get() {
    static Type_ theEmptySource;
    return theEmptySource;
}
 
// MARK: public (non-static)
 
Template_
inline Type_::EmptySource() {}
 
Template_
inline Type_ & Type_::operator =(EmptySource) {
    return *this;
}
 
Template_
inline bool Type_::operator !() const {
    return true;
}
 
Template_
inline ThisItem & Type_::operator *() const {
    assert(0);
    throw std::logic_error("The source is empty.");
}
 
Template_
inline bool Type_::Equals(EmptySource const &) const {
    return true;
}
 
Template_
inline void Type_::Pop() {
    assert(0);
    throw std::logic_error("The source is empty.");
}
 
Template_
inline void Type_::Swap(EmptySource &) {}
 
    #undef Type_
    #undef Template_
 
// MARK: - Om::Source::
 
    #define Template_ \
    template <typename TheItem>
 
    #define Type_ \
    Om::Source::EmptySource<TheItem>
 
Template_
inline bool Om::Source::operator ==(
    Type_ const &,
    Type_ const &
) {
    return true;
}
 
Template_
inline bool Om::Source::operator !=(
    Type_ const &,
    Type_ const &
) {
    return false;
}
 
// MARK: - boost::
 
Template_
inline void boost::swap(
    Type_ & theFirst,
    Type_ & theSecond
) {
    theFirst.Swap(theSecond);
}
 
    #undef Type_
    #undef Template_
 
#endif