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9f12e2e4a4
Let ArchetypeType nested types and PotentialArchetypes be bound to concrete types in addition to archetypes. Constraints to outer context archetypes still suffer type-checker issues, but constraints to true concrete types should work now. Swift SVN r14832
126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
//===- STLExtras.h - additions to the STL -----------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file Provides STL-style algorithms for convenience.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_INTERLEAVE_H
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#define SWIFT_BASIC_INTERLEAVE_H
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#include <functional>
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#include <cassert>
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namespace swift {
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/// @{
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/// An STL-style algorithm similar to std::for_each that applies a second
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/// functor between every pair of elements.
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///
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/// This provides the control flow logic to, for example, print a
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/// comma-separated list:
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/// \code
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/// interleave(names.begin(), names.end(),
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/// [&](StringRef name) { OS << name; },
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/// [&] { OS << ", "; });
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/// \endcode
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template <typename ForwardIterator, typename UnaryFunctor,
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typename NullaryFunctor>
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inline void interleave(ForwardIterator begin, ForwardIterator end,
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UnaryFunctor each_fn,
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NullaryFunctor between_fn) {
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if (begin == end)
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return;
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each_fn(*begin);
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++begin;
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for (; begin != end; ++begin) {
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between_fn();
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each_fn(*begin);
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}
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}
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template <typename Container, typename UnaryFunctor, typename NullaryFunctor>
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inline void interleave(const Container &c, UnaryFunctor each_fn,
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NullaryFunctor between_fn) {
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interleave(c.begin(), c.end(), each_fn, between_fn);
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}
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/// @}
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/// @{
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/// The equivalent of std::for_each, but for two lists at once.
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template <typename InputIt1, typename InputIt2, typename BinaryFunction>
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inline void for_each(InputIt1 I1, InputIt1 E1, InputIt2 I2, BinaryFunction f) {
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while (I1 != E1) {
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f(*I1, *I2);
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++I1; ++I2;
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}
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}
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template <typename Container1, typename Container2, typename BinaryFunction>
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inline void for_each(const Container1 &c1, const Container2 &c2,
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BinaryFunction f) {
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assert(c1.size() == c2.size());
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for_each(c1.begin(), c1.end(), c2.begin(), f);
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}
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/// The equivalent of std::for_each, but for three lists at once.
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template <typename InputIt1, typename InputIt2, typename InputIt3,
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typename TernaryFunction>
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inline void for_each3(InputIt1 I1, InputIt1 E1, InputIt2 I2, InputIt3 I3,
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TernaryFunction f) {
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while (I1 != E1) {
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f(*I1, *I2, *I3);
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++I1; ++I2; ++I3;
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}
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}
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template <typename Container1, typename Container2, typename Container3,
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typename TernaryFunction>
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inline void for_each3(const Container1 &c1, const Container2 &c2,
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const Container3 &c3,
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TernaryFunction f) {
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assert(c1.size() == c2.size());
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assert(c2.size() == c3.size());
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for_each3(c1.begin(), c1.end(), c2.begin(), c3.begin(), f);
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}
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/// @}
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/// @{
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/// Declares a member \c type that is a std::function compatible with the given
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/// callable type.
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///
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/// \tparam T A callable type, such as a lambda.
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template <typename T>
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struct as_function : public as_function<decltype(&T::operator())> {};
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template <typename L, typename R, typename... Args>
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struct as_function<R(L::*)(Args...) const> {
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using type = std::function<R(Args...)>;
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};
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/// @}
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/// Returns a std::function that can call a lambda without copying it.
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template <typename L>
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static typename as_function<L>::type makeStackLambda(const L &theLambda) {
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return std::cref(theLambda);
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}
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} // end namespace swift
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#endif
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