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V1017. Variable of the 'string_view' ty…
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
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Additional information
Contents

V1017. Variable of the 'string_view' type references a temporary object which will be removed after evaluation of an expression.

May 8, 2018

The analyzer has detected that an instance of class 'std::string_view' is initialized by or assigned a temporary object.

Consider the following example:

std::string hello = "Hello, ";
std::string_view helloWorldPtr = hello + "world\n";
std::cout << helloWorldPtr;

In the second line of this code, a temporary object of the type 'std::string' will be created, the pointer to which will be copied when initializing the instance of the 'std::string_view' class. After that, once the initialization expression has been evaluated, the temporary object will be destroyed; therefore, the pointer used in the third line will be referring to a freed memory block.

This is the fixed version:

std::string hello = "Hello, ";
const std::string helloWorld = hello + "world\n";
std::string_view helloWorldPtr = helloWorld;
std::cout << helloWorldPtr;

This diagnostic is classified as:

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