pointers - Pass double by reference C++ -

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given 

double skewangle;

how pass variable function , have modified without returning value?

my current function declaration looks this:

mat findcard(mat& baseimage, double *angle)

when try findcard(baseimage, *skewangle);

i deceleration not found, can show me how can this?

you're passing variable pointer, not reference, need pass address of variable function, such as:

findcard(baseimage, &skewangle);

if want pass reference, need change function declaration to:

mat findcard(mat& baseimage, double& angle)

and can pass variable directly function, such as:

findcard(baseimage, skewangle);

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