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062ad267c4
Implement switch statements with simple value comparison to get the drudge work of parsing and generating switches in place. Cases are checked using a '=~' operator to compare the subject of the switch to the value in the case. Unlike a C switch, cases each have their own scope and don't fall through. 'break' and 'continue' apply to an outer loop rather to the switch itself. Multiple case values can be specified in a comma-separated list, as in 'case 1, 2, 3, 4:'. Currently no effort is made to check for duplicate cases or to rank cases by match strength; cases are just checked in source order, and the first one wins (aside from 'default', which is branched to if all cases fail). Swift SVN r4359
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
//===- Interleave.h - for_each between sequence elements --------*- 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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// This file provides interleave, an STL-style algorithm similar to
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// std::for_each that applies a second functor between every pair of elements.
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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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//
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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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//
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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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namespace swift {
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template <typename ForwardIterator,
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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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} // end namespace swift
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#endif |