libpqxx
The C++ client library for PostgreSQL
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The built-in arithmetic types do not have inherent null values. More...
Additional Inherited Members | |
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static constexpr bool | is_null (T const &) noexcept |
Does a given value correspond to an SQL null value? More... | |
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static constexpr bool | has_null |
Does TYPE have a "built-in null value"? More... | |
static constexpr bool | always_null |
Are all values of this type null? More... | |
The built-in arithmetic types do not have inherent null values.
Not-a-Number values (or NaNs for short) behave a lot like an SQL null, but they are not nulls. A non-null SQL float can be NaN.