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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author OpportunityLiu
-- @file math.lua
--
-- define module
local math = math or {}
-- init constants
math.nan = 0/0 -- use 0/0 instead of math.log(-1) for better cross-platform compatibility (e.g., Solaris)
math.e = math.exp(1)
math.inf = 1/0 -- @see http://lua-users.org/wiki/InfAndNanComparisons
-- check a number is int
--
-- @returns true for int, otherwise false
--
function math:isint()
assert(type(self) == "number", "number expacted")
return self == math.floor(self) and self ~= math.huge and self ~= -math.huge
end
-- check a number is inf or -inf
--
-- @returns 1 for inf, -1 for -inf, otherwise false
--
function math:isinf()
assert(type(self) == "number", "number expacted")
if self == math.inf then
return 1
elseif self == -math.inf then
return -1
else
return false
end
end
-- check a number is nan
--
-- @returns true for nan, otherwise false
--
function math:isnan()
assert(type(self) == "number", "number expacted")
return self ~= self
end
-- return module
return math
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