/// <summary>
/// If the <paramref name="instruction"/> has a variable operand, retrieves it.
/// </summary>
/// <param name="instruction"><see cref="Instruction"/> to look at</param>
/// <param name="indexedVariables">Collection of variables that are potentially referenced by the operand</param>
/// <param name="variable"><see cref="VariableDefinition"/> to populate with the referenced indexed variable, if possible.</param>
/// <returns><c>true</c> if the operand is an index for a variable in the <paramref name="indexedVariables"/>, else <c>false</c>.</returns>
private static bool TryGetIndexedVariableOperand(
Instruction instruction,
IEnumerable<VariableDefinition> indexedVariables,
ref VariableDefinition variable)
{
int? variableIndex;
if (!instruction.TryGetVariableIndex(out variableIndex)) { return false; }
Contract.Assert(variableIndex.HasValue);
variable = indexedVariables.FirstOrDefault(
possibleInitializationVariable => possibleInitializationVariable.Index == variableIndex.Value);
return variable != null;
}
