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V1007. The value from the uninitialized…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V1007. The value from the uninitialized optional is used. Probably it is a mistake.

Dec. 25, 2017

The analyzer has detected an issue that has to do with accessing the value of an object of class 'optional', which was not previously initialized, that is, does not store any value. Technically, this issue leads to undefined behavior and gives rise to other errors.

Consider the following example of incorrect code:

std::optional<Value> opt;
if (cond)
{
  opt->max = 10;
  opt->min = 20;
}

if (opt)
{
  ....
}

In this example, the 'opt' variable was never initialized, which, in its turn, prevents the code in the "if (opt)" branch from executing.

Fixed version:

std::optional<Value> opt;
if (cond)
{
  opt = Value(10, 20);
}

if (opt)
{
    ....
}

The analyzer can also detect situations where the value of a potentially uninitialized object of type 'optional' is accessed. For example:

boost::optional<int> opt = boost::none;
opt = interpret(tr);
    
if (cond)
  opt = {};
    
process(*opt);

Fixed version:

boost::optional<int> opt = boost::none;
opt = interpret(tr);
    
if (!cond)
  process(*opt);

This diagnostic is classified as:

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