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.. title:: clang-tidy - cppcoreguidelines-narrowing-conversions
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;``.
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