fixed nh.getParam template with gcc-arm-none-eabi#587
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with the following code:
```cpp
template <typename T>
static inline T get_single_param_(const char *param_name, T default_value)
{
std::array<T, 1> buf;
if (nh.getParam(param_name, buf.data())) {
return buf[0];
} else {
return default_value;
}
}
```
Under rp2040 (arm-none-eabi-gcc, 32bit), if T is "int", gcc will convert
the int to "short int" thus failing compilation.
Using "int32_t" for T didn't help, and fundamentally it's a problem of
"int" not being really cross-platform.
Changing the "int" in rosserial_client to "int32_t" fixed the issue.
Ultimately, all "int" in the codebase should be "int32_t" including
message_generation, but that would be a breaking change.
Even this change might be breaking for some codes.
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with the following code:
Under rp2040 (arm-none-eabi-gcc, 32bit), if T is "int", gcc will convert
the int to "short int" thus failing compilation.
Using "int32_t" for T didn't help, and fundamentally it's a problem of
"int" not being really cross-platform.
Changing the "int" in rosserial_client.h to "int32_t" fixed the issue.
Ultimately, all "int" in the codebase should be "int32_t" including
message_generation, but that would be a breaking change.
Even this change might be breaking for some codes.