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V2564. MISRA. There should be no implic…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
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Contents

V2564. MISRA. There should be no implicit integral-floating conversion.

04 Déc 2019

This diagnostic rule is based on the software development guidelines developed by MISRA (Motor Industry Software Reliability Association).

This diagnostic rule applies only to code written in C++.

The code should not contain implicit conversions:

  • From floating-point types to integer types,
  • From integer types to floating-point types.

Integer types are:

  • 'signed char', 'unsigned char',
  • 'short', 'unsigned short',
  • 'int', 'unsigned int',
  • 'long', 'unsinged long',
  • 'long long', 'unsigned long long'.

Floating-point types are:

  • 'float',
  • 'double',
  • 'long double'.

Implicit conversion from floating-point types to integer types may result in losing some part of the value (for example, the decimal part) or lead to undefined behavior if the floating-point value cannot be represented as an integer value.

Implicit conversion from integer types to floating-point types may result in imprecise representation not meeting the developer's expectations.

Example of non-compliant code:

void foo1(int x, float y);
void foo2()
{
  float y = 10; 
  int x = 10.5;  
  foo1(y, x); 
}

Example of code considered compliant from the point of view of this diagnostic:

void foo1(int x, float y);
void foo2()
{
  float y = static_cast<float>(10); 
  int x = static_cast<int>(10.5);  
  foo1(static_cast<int>(y), static_cast<float>(x)); 
}

This diagnostic is classified as:

  • MISRA-CPP-5.0.5
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