utility.h

Utility

A few useful utility functions and classes.

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pair

template <typename T1, typename T2>

struct pair

A clone of std::pair

C++03

template <typename T1, typename T2>

pair<T1, T2> make_pair(T1 a, T2 b)

C++11 and above

template <typename T1, typename T2>

pair<T1, T2> make_pair(T1&& a, T2&& b)

Returns a pair.

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Template deduction guides

C++17 and above

template <typename T1, typename T2>

pair(T1, T2) ->pair<T1, T2>;

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exchange

template <typename T, typename U = T>

T exchange(T& object, const U& new_value)

Copies the new value to object and returns the old value.

Note: This is not an atomic operation.

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add_const

template <typename T>

typename etl::add_const<T>::type& as_const(T& t)

Returns a value of type T as a const T.

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functor

For C++11 and above.

template <typename TReturn, typename... TParams>

class functor

Wraps a free/global function in a functor.

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constexpr functor(TReturn(*ptr_)(TParams...))

Constructs a functor from a function pointer.

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TReturn operator()(TParams... args)

Function operator.

Calls the wrapped function with the forwarded parameters.

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TReturn operator()(TParams... args) const

Function operator.

Calls the wrapped function with the forwarded parameters.

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integer_sequence

20.14.0

template <typename T, T... Integers>

class integer_sequence

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index_sequence

20.14.0

template <size_t... Indices>

using index_sequence = etl::integer_sequence<size_t, Indices...>;

template <size_t N>

make_index_sequence