File hashCombine.h

namespace lsst

Remove all non-astronomical counts from the Chunk Exposure’s pixels.

Class for a simple mapping implementing a generic AstrometryTransform.

It uses a template rather than a pointer so that the derived classes can use the specifics of the transform. The class simplePolyMapping overloads a few routines.

Forward declarations for lsst::utils::Cache

For details on the Cache class, see the Cache.h file.

A base class for image defects

Numeric constants used by the Integrate.h integrator routines.

Compute Image Statistics

Note

Gauss-Kronrod-Patterson quadrature coefficients for use in quadpack routine qng. These coefficients were calculated with 101 decimal digit arithmetic by L. W. Fullerton, Bell Labs, Nov 1981.

Note

The Statistics class itself can only handle lsst::afw::image::MaskedImage() types. The philosophy has been to handle other types by making them look like lsst::afw::image::MaskedImage() and reusing that code. Users should have no need to instantiate a Statistics object directly, but should use the overloaded makeStatistics() factory functions.

namespace utils

Functions

std::size_t hashCombine(std::size_t seed)

Combine hashes

A specialization of hashCombine for a trivial argument list.

template<typename T, typename ...Rest>
std::size_t hashCombine(std::size_t seed, const T &value, Rest... rest)

Combine hashes

This is provided as a convenience for those who need to hash a composite. C++11 includes std::hash, but neglects to include a facility for combining hashes.

Shall not throw exceptions.

Return

A combined hash for all the arguments after seed.

Template Parameters

  • TRest: the types to hash. All types must have a valid (in particular, non-throwing) specialization of std::hash.

Parameters

  • seed: An arbitrary starting value.

  • valuerest: The objects to hash.

To use it: 

// Arbitrary seed; can change to get different hashes of same argument list
std::size_t seed = 0;
result = hashCombine(seed, obj1, obj2, obj3);

template<typename InputIterator>
std::size_t hashIterable(std::size_t seed, InputIterator begin, InputIterator end)

Combine hashes in an iterable.

This is provided as a convenience for those who need to hash a container.

Shall not throw exceptions.

Return

A combined hash for all the elements in [begin, end).

Template Parameters

  • InputIterator: an iterator to the objects to be hashed. The pointed-to type must have a valid (in particular, non-throwing) specialization of std::hash.

Parameters

  • seed: An arbitrary starting value.

  • beginend: The range to hash.

To use it: 

// Arbitrary seed; can change to get different hashes of same argument list
std::size_t seed = 0;
result = hashIterable(seed, container.begin(), container.end());