modernize-avoid-c-arrays¶
cppcoreguidelines-avoid-c-arrays redirects here as an alias for this check.
hicpp-avoid-c-arrays redirects here as an alias for this check.
Finds C-style array types and recommend to use std::array<>
/
std::vector<>
. All types of C arrays are diagnosed.
However, fix-it are potentially dangerous in header files and are therefore not emitted right now.
int a[] = {1, 2}; // warning: do not declare C-style arrays, use std::array<> instead
int b[1]; // warning: do not declare C-style arrays, use std::array<> instead
void foo() {
int c[b[0]]; // warning: do not declare C VLA arrays, use std::vector<> instead
}
template <typename T, int Size>
class array {
T d[Size]; // warning: do not declare C-style arrays, use std::array<> instead
int e[1]; // warning: do not declare C-style arrays, use std::array<> instead
};
array<int[4], 2> d; // warning: do not declare C-style arrays, use std::array<> instead
using k = int[4]; // warning: do not declare C-style arrays, use std::array<> instead
However, the extern "C"
code is ignored, since it is common to share
such headers between C code, and C++ code.
// Some header
extern "C" {
int f[] = {1, 2}; // not diagnosed
int j[1]; // not diagnosed
inline void bar() {
{
int j[j[0]]; // not diagnosed
}
}
}
Similarly, the main()
function is ignored. Its second and third parameters
can be either char* argv[]
or char** argv
, but cannot be
std::array<>
.