Difference between revisions of "Assert"
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=== Description === | === Description === | ||
| − | Issues an error when the value of its argument ''v'' is false (i.e. | + | Issues an error when the value of its argument ''v'' is false (i.e.: nil or false), otherwise returns all its arguments. |
<source lang="lua"> | <source lang="lua"> | ||
assert(v,message) | assert(v,message) | ||
Revision as of 09:01, 2 March 2021
Available since: Gideros 2011.6
Class: (global)
Description
Issues an error when the value of its argument v is false (i.e.: nil or false), otherwise returns all its arguments.
assert(v,message)
message is an error message, when absent it defaults to "assertion failed!".
Parameters
v: (any) expression/function to assert
message: (string) error message if assert fails optional
Example
Checks if a texture is valid
function isValidTexture()
local result, msg = assert(Texture.new(texturepath), "file is not recognised")
print(result, msg)
return result
end
function showTexture()
if isValidTexture() then bmp = Bitmap.new(Texture.new(texturepath)) end
end
