Less‐than operators

Synopses

Declared in <bdlb_guid.h>

Return true if the specified lhs is less than the specified rhs.

bool
operator<(
    Guid const& lhs,
    Guid const& rhs);

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Return true if the underlying iterator of lhs is less than rhs.

template<
    class FUNCTOR,
    class ITERATOR>
bool
operator<(
    TransformIterator<FUNCTOR, ITERATOR> const& lhs,
    TransformIterator<FUNCTOR, ITERATOR> const& rhs);

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See the overload above for contract.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValueRef<LHS_TYPE> const& lhs,
    ConstNullableValueRef<RHS_TYPE> const& rhs);

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    ConstNullableValueRef<LHS_TYPE> const& lhs,
    NullableValueRef<RHS_TYPE> const& rhs);

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Return whether rhs is not null.

template<class TYPE>
bool
operator<(
    bsl::nullopt_t const& lhs,
    ConstNullableValueRef<TYPE> const& rhs) noexcept;

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Return false; nullopt never orders after a nullable reference.

template<class TYPE>
bool
operator<(
    ConstNullableValueRef<TYPE> const& lhs,
    bsl::nullopt_t const& rhs) noexcept;

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    LHS_TYPE const& lhs,
    ConstNullableValueRef<RHS_TYPE> const& rhs);

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    ConstNullableValueRef<LHS_TYPE> const& lhs,
    RHS_TYPE const& rhs);

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    ConstNullableValueRef<LHS_TYPE> const& lhs,
    ConstNullableValueRef<RHS_TYPE> const& rhs);

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Return whether rhs is not null.

template<class TYPE>
bool
operator<(
    bsl::nullopt_t const& lhs,
    NullableValueRef<TYPE> const& rhs) noexcept;

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Return false; nullopt never orders after a nullable reference.

template<class TYPE>
bool
operator<(
    NullableValueRef<TYPE> const& lhs,
    bsl::nullopt_t const& rhs) noexcept;

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    LHS_TYPE const& lhs,
    NullableValueRef<RHS_TYPE> const& rhs);

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValueRef<LHS_TYPE> const& lhs,
    RHS_TYPE const& rhs);

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Return whether lhs is ordered before rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValueRef<LHS_TYPE> const& lhs,
    NullableValueRef<RHS_TYPE> const& rhs);

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Return whether the specified lhs is ordered before the specified rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValue<LHS_TYPE> const& lhs,
    NullableValue<RHS_TYPE> const& rhs)
requires requires {
        { *lhs < *rhs } ‐> NullableValue_ConvertibleToBool;
    };

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Return whether the left‐hand operand is ordered before the right.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    bsl::optional<LHS_TYPE> const& lhs,
    NullableAllocatedValue<RHS_TYPE> const& rhs);

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Return whether the left‐hand operand is ordered before the right.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableAllocatedValue<LHS_TYPE> const& lhs,
    bsl::optional<RHS_TYPE> const& rhs);

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Return true if the specified rhs is not null, and false otherwise. Note that bsl::nullopt is ordered before any NullableAllocatedValue that is not null.

template<class TYPE>
bool
operator<(
    bsl::nullopt_t const& nullopt,
    NullableAllocatedValue<TYPE> const& rhs) noexcept;

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Return false. Note that bsl::nullopt never orders after a NullableAllocatedValue.

template<class TYPE>
bool
operator<(
    NullableAllocatedValue<TYPE> const& lhs,
    bsl::nullopt_t const& nullopt) noexcept;

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Return whether the left‐hand operand is ordered before the right.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    LHS_TYPE const& lhs,
    NullableAllocatedValue<RHS_TYPE> const& rhs);

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Return whether the left‐hand operand is ordered before the right.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableAllocatedValue<LHS_TYPE> const& lhs,
    RHS_TYPE const& rhs);

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Return whether the left‐hand operand is ordered before the right.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableAllocatedValue<LHS_TYPE> const& lhs,
    NullableAllocatedValue<RHS_TYPE> const& rhs);

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Return whether the specified lhs is ordered before the specified rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    LHS_TYPE const& lhs,
    NullableValue<RHS_TYPE> const& rhs)
requires (!NullableValue_DerivedFromOptional<LHS_TYPE>) &&
    requires { { lhs < *rhs } ‐> NullableValue_ConvertibleToBool; };

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Return whether the specified lhs is ordered before the specified rhs.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValue<LHS_TYPE> const& lhs,
    RHS_TYPE const& rhs)
requires (!NullableValue_DerivedFromOptional<RHS_TYPE>) &&
    requires { { *lhs < rhs } ‐> NullableValue_ConvertibleToBool; };

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Return true if lhs is ordered before rhs, and false otherwise.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValue<LHS_TYPE> const& lhs,
    std::optional<RHS_TYPE> const& rhs)
requires requires {
        { *lhs < *rhs } ‐> NullableValue_ConvertibleToBool;
    };

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Return true if lhs is ordered before rhs, and false otherwise.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    std::optional<LHS_TYPE> const& lhs,
    NullableValue<RHS_TYPE> const& rhs)
requires requires {
        { *lhs < *rhs } ‐> NullableValue_ConvertibleToBool;
    };

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Return true if lhs is ordered before rhs, and false otherwise.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    NullableValue<LHS_TYPE> const& lhs,
    bsl::optional<RHS_TYPE> const& rhs)
requires requires {
        { *lhs < *rhs } ‐> NullableValue_ConvertibleToBool;
    };

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Return true if lhs is ordered before rhs, and false otherwise.

template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    bsl::optional<LHS_TYPE> const& lhs,
    NullableValue<RHS_TYPE> const& rhs)
requires requires {
        { *lhs < *rhs } ‐> NullableValue_ConvertibleToBool;
    };

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Return Value

  • true if lhs is less than rhs, and false otherwise

  • true if the underlying iterator of lhs is less than that of rhs, and false otherwise

  • true if lhs is ordered before rhs, and false otherwise

  • true if the specified lhs nullable wrapper is ordered before the specified rhs nullable object, and false otherwise

  • true if the specified rhs is not null, and false otherwise

  • false; nullopt never orders after a nullable reference

  • true if the specified lhs is ordered before the specified rhs nullable wrappers, and false otherwise

  • true if the specified lhs nullable wrapper is ordered before the specified rhs, and false otherwise

  • true if rhs is not null, and false otherwise

  • false

Parameters

Name

Description

lhs

left‐hand operand

rhs

right‐hand operand

nullopt

disengaged‐optional tag; value is unused

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