cppcoreguidelines-narrowing-conversions¶
Checks for silent narrowing conversions, e.g: int i = 0; i += 0.1;
. While
the issue is obvious in this former example, it might not be so in the
following: void MyClass::f(double d) { int_member_ += d; }
.
This rule is part of the “Expressions and statements” profile of the C++ Core Guidelines, corresponding to rule ES.46. See
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Res-narrowing.
- We enforce only part of the guideline, more specifically, we flag:
All floating-point to integer conversions that are not marked by an explicit cast (c-style or
static_cast
). For example:int i = 0; i += 0.1;
,void f(int); f(0.1);
,All applications of binary operators where the left-hand-side is an integer and the right-hand-size is a floating-point. For example:
int i; i+= 0.1;
.