Fix: using udl::operator "" _

[x4t3a]

The following error started appearing error: missing space between ‘""’ and suffix identifier -- using udl::operator ""_;.

Compiler: powerpc-fsl-linux-g++ (GCC) 4.9.2 (compiler for powerpc architecture)
C++ version: --std=c++11

Easy fix by adding spaces :)

[yhirose]

@x4t3a, thanks for the pull request. The real cause of this problem is the clangformat setting .clangformt in this project. I often format httplib.h with it, and the current .clangformat removes the space... Here is the current setting:

BasedOnStyle: LLVM
AllowShortBlocksOnASingleLine: true
AllowShortCaseLabelsOnASingleLine: true
AllowShortIfStatementsOnASingleLine: true
Cpp11BracedListStyle: true

I'll find a setting that can avoid the particular behavior of clangformat. Thanks.

[x4t3a]

@yhirose, I've tried running your clang-format config in this online formatter and it seems ok. There are several versions there to try on. What version do you use?

[yhirose]

@x4t3a, mine is installed via home brew on macOS. Here is the version.

> clang-format --version
clang-format version 10.0.1 

Also the line 2271 has the same issue.

[yhirose]

I confirmed the happens on the online checker as well.

[yhirose]

@x4t3a, when you have time, could you try this solution for old gcc compilers? If this workaround works on your environment, I'll put it in httplib.h. Thanks for your help!

[x4t3a]

@yhirose, alright, I'll try it. Thank you! :)

[yhirose]

I'll close it for now.

[liangyepianzhou]

@yhirose Thanks for your answer. I also encountered this problem. I am a C++ newbie. Do you mind telling me what is the minimum g++ standard to solve this problem?