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Adding the __concat metamethod for easy string concatenation #3

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Adding the __concat metamethod for easy string concatenation #3

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6 changes: 6 additions & 0 deletions bint.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -1725,6 +1725,12 @@ function bint:__tostring()
return self:tobase(10)
end

--- Convert a bint to a string when concatenating it to an other string.
-- @see bint.tostring
function bint.__concat(a, b)
return tostring(a) .. tostring(b)
end

-- Allow creating bints by calling bint itself
setmetatable(bint, {
__call = function(_, x)
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4 changes: 4 additions & 0 deletions tests.lua
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Expand Up @@ -105,6 +105,10 @@ local function test(bits, wordbits)
assert(bint.frombase('AAAAAAAAAAAAAAAAAAA') == nil)
assert(bint.frombase('AAAAAAAAAAAAAAAAAAA_') == nil)

assert(bint(9592924) .. '_MyString' == '9592924_MyString')
assert('MyString_' .. bint(9592924) == 'MyString_9592924')
assert('MyString_' .. bint(9592924) .. "_MyString" == 'MyString_9592924_MyString')

assert(bint.fromstring(1) == nil)
assert(bint.eq(bint.fromstring('0xff'), 0xff))
assert(bint.eq(bint.fromstring('+0xff'), 0xff))
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