tests/misc/t8404.nim


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discard """
  targets: "c cpp js"
"""
template main() =
  block: # bug #8404
    # can conv
    template float2int(T) =
      var a = -1.0
      let b = T(a)
      doAssert b < 0
      let c = b + 1
      doAssert c is T
      doAssert c == 0

    float2int(int8)
    float2int(int16)
    float2int(int32)
    float2int(int64)

  block:
    # can handle middle conv
    # `/` can trigger int to float
    template float2int(T) =
      let n = T(1 / 256)
      doAssert n == 0

    float2int(int8)
    float2int(int16)
    float2int(int32)
    # float2int(int64)
main()
static:
  main()
# Copyright (C) 2009, 2010  Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

class HistoryEmptyException(Exception):
	pass

class History(object):
	def __init__(self, maxlen = None):
		from collections import deque
		self.history = deque(maxlen = maxlen)
		self.history_forward = deque(maxlen = maxlen)

	def add(self, item):
		if len(self.history) == 0 or self.history[-1] != item:
			self.history.append(item)
			self.history_forward.clear()

	def modify(self, item):
		try:
			self.history[-1] = item
		except IndexError:
			raise HistoryEmptyException

	def __len__(self):
		return len(self.history)

	def current(self):
		try:
			return self.history[-1]
		except IndexError:
			raise HistoryEmptyException()

	def top(self):
		try:
			return self.history_forward[-1]
		except IndexError:
			try:
				return self.history[-1]
			except IndexError:
				raise HistoryEmptyException()

	def bottom(self):
		try:
			return self.history[0]
		except IndexError:
			raise HistoryEmptyException()

	def back(self):
		if len(self.history) > 1:
			self.history_forward.appendleft( self.history.pop() )
		return self.current()

	def move(self, n):
		if n > 0:
			return self.forward()
		if n < 0:
			return self.back()

	def __iter__(self):
		return self.history.__iter__()

	def next(self):
		return self.history.next()

	def forward(self):
		if len(self.history_forward) > 0:
			self.history.append( self.history_forward.popleft() )
		return self.current()

	def fast_forward(self):
		if self.history_forward:
			self.history.extend(self.history_forward)
			self.history_forward.clear()