Null values
[Type Manipulation and Column Name re-mapping]

Functions
template<typename U>
enable_if < boost::is_arithmetic< U >, U > ::type	eepgwde::detail::i0::null1 (dummy< 0 >=0)
	Any numeric types: use the system minimum.
template<typename U>
disable_if_c < boost::is_base_of < boost::any, U >::value||boost::is_arithmetic < U >::value||boost::is_arithmetic < typename U::value_type > ::value||boost::is_base_of < std::string, U >::value||!(boost::has_trivial_default_constructor < U >::value), U >::type	eepgwde::detail::i0::null1 (dummy< 1 >=1)

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Detailed Description

A null value needs to be added for most one of the typical input data-types. It's used to help with type-checking.

The singleton class also maintains a list of type names and null0 values accepted and able to be rendered.

This uses some boost::type_traits. It can cover most plain-old numeric types, strings and dates. Special scaled Numeric classes can be handled.

This only creates the null0 value. The rendering is a another issue. The rendering as() methods use the relationships between the null0 types.

See also:

eepgwde::detail::Typing, eepgwde::detail::null0

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Function Documentation

template<typename U>

disable_if_c< boost::is_base_of< boost::any, U >::value||boost::is_arithmetic< U >::value||boost::is_arithmetic< typename U::value_type >::value||boost::is_base_of< std::string, U >::value||!(boost::has_trivial_default_constructor< U >::value), U >::type eepgwde::detail::i0::null1

(

dummy< 1 >

= 1

)

[inline]

If all else fails assume it is a type with a default value constructor.

This should match all of those that aren't specified here.

If all else fails assume it is a type with a default value constructor.

This should match all of those that aren't specified here.

Definition at line 62 of file scalt4.cpp.

template<typename U>

enable_if< boost::is_same< ql::Date, U >, U >::type eepgwde::detail::i0::null1

(

dummy< 0 >

= 0

)

[inline]

Any numeric types: use the system minimum.

A null for QuantLib date.

The generic null is boost::any.

Numeric derivations: avoid clash with string.

Dates: use an old one.

Strings: use an empty one.

A place to group null0 templated methods.

See also:

null0

Definition at line 24 of file scalt4.cpp.