compilation of initial example **produces some errors** on Godbolt.org during compilation

[F-Haferkorn]

Describe the bug:
clicking on your link “here” In https://github.com/johnmcfarlane/cnl/blob/main/README.md
“You can try out CNL on Compiler Explorer here.”
Does compilation produces some errors on Godbolt.org during compilation

• I tried to get an overview of the cnl-project*
  *clicking on the link “here” In
  “You can try out CNL on Compiler Explorer here.”
  following the Readme.md
• Godbolt produced lots of compilerr errors

To Reproduce:
see below an excerpt the error mesages of https://godbolt.org/z/vzdvYzeqW
Try to compile the project
https://github.com/johnmcfarlane/cnl/blob/main/README.md
here

Expected behaviour:
expected: godbolt example compiles successfully

**Desktop **

• OS: N/A Godbolt.org internal
• Compiler: 86_64 gcc 11.1
• Compiler flags used: -std=c++20
• CMake version N./A.
• Conan version N./A.
• CNL version (or Git branch/SHA) main

Link to Compiler Explorer:
An example of the failure using Compiler Explorer
Compiler Explorer.

Additional context:

The complete set of error messages.....

: In function 'int main()': :20:25: error: 'numeric_limits' is not a member of 'cnl'; did you mean 'std::numeric_limits'? 20 | auto epsilon = cnl::numeric_limits::min(); // 1/256 | ^~~~~~~~~~~~~~ In file included from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/used_digits.h:12, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/num_traits/digits.h:15, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/bit.h:13, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:228, from :1: /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/limits:312:12: note: 'std::numeric_limits' declared here 312 | struct numeric_limits : public __numeric_limits_base | ^~~~~~~~~~~~~~ :20:44: error: expected primary-expression before '>' token 20 | auto epsilon = cnl::numeric_limits::min(); // 1/256 | ^ :20:47: error: '::min' has not been declared 20 | auto epsilon = cnl::numeric_limits::min(); // 1/256 | ^~~ :20:47: note: suggested alternatives: In file included from /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/algorithm:62, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:20, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/constant.h:17, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:230, from :1: /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/bits/stl_algo.h:3455:5: note: 'std::min' 3455 | min(initializer_list<_Tp> __l, _Compare __comp) | ^~~ In file included from /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/algorithm:64, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:20, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/constant.h:17, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:230, from :1: /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/bits/ranges_algo.h:3164:29: note: 'std::ranges::min' 3164 | inline constexpr __min_fn min{}; | ^~~ In file included from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:233, from :1: /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h: In instantiation of 'constexpr auto cnl::literals::operator""_cnl2() [with char ...Chars = {'1', '6', '3', '8', '4', '.', '0', '0', '0', '0', '1', '5', '2', '5', '8', '7', '8', '9', '0', '6', '2', '5'}]': :28:14: required from here /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:170:72: in 'constexpr' expansion of 'cnl::_impl::parse_real()' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:335:38: in 'constexpr' expansion of 'cnl::_impl::parse_string()' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:300:58: in 'constexpr' expansion of 'cnl::_impl::parse_string(const char [22]{'1', '6', '3', '8', '4', '.', '0', '0', '0', '0', '1', '5', '2', '5', '8', '7', '8', '9', '0', '6', '2', '5'}, 21, 0, 10, 18, 0)' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:294:40: in 'constexpr' expansion of 'cnl::_impl::parse_string((((const char*)str) + ((sizetype)first_numeral)), num_digits, ((int)is_negative), base, stride)' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:283:38: in 'constexpr' expansion of '((long int (*)(const long int&))chunk_scale_op)((*(const long int*)(& std::move(init))))' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:336:50: in 'constexpr' expansion of '0->cnl::_impl::make_scale_op_chunk(int)::()' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:170:28: error: overflow in constant expression [-fpermissive] 170 | constexpr auto parsed{_impl::parse_real()}; | ^~~~~~ /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:171:94: error: no matching function for call to 'make_from_udl::significand, parsed.cnl::_impl::descaled::exponent, cnl::_impl::descaled::radix, 2>()' 171 | return _impl::make_from_udl(); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~ /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:116:38: note: candidate: 'template, >] ParsedSignificand, auto [requires cnl::integer<, >] ParsedExponent, int ParsedRadix, int UdlRadix> constexpr auto cnl::_impl::make_from_udl()' 116 | [[nodiscard]] constexpr auto make_from_udl() | ^~~~~~~~~~~~~ /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:116:38: note: template argument deduction/substitution failed: :29:24: error: template argument 1 is invalid 29 | static_assert(std::is_same_v>>); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :32:24: error: template argument 1 is invalid 32 | static_assert(std::is_same_v>>); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ASM generation compiler returned: 1 : In function 'int main()': :20:25: error: 'numeric_limits' is not a member of 'cnl'; did you mean 'std::numeric_limits'? 20 | auto epsilon = cnl::numeric_limits::min(); // 1/256 | ^~~~~~~~~~~~~~ In file included from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/used_digits.h:12, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/num_traits/digits.h:15, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/bit.h:13, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:228, from :1: /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/limits:312:12: note: 'std::numeric_limits' declared here 312 | struct numeric_limits : public __numeric_limits_base | ^~~~~~~~~~~~~~ :20:44: error: expected primary-expression before '>' token 20 | auto epsilon = cnl::numeric_limits::min(); // 1/256 | ^ :20:47: error: '::min' has not been declared 20 | auto epsilon = cnl::numeric_limits::min(); // 1/256 | ^~~ :20:47: note: suggested alternatives: In file included from /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/algorithm:62, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:20, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/constant.h:17, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:230, from :1: /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/bits/stl_algo.h:3455:5: note: 'std::min' 3455 | min(initializer_list<_Tp> __l, _Compare __comp) | ^~~ In file included from /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/algorithm:64, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:20, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/constant.h:17, from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:230, from :1: /opt/compiler-explorer/gcc-11.1.0/include/c++/11.1.0/bits/ranges_algo.h:3164:29: note: 'std::ranges::min' 3164 | inline constexpr __min_fn min{}; | ^~~ In file included from /opt/compiler-explorer/libs/cnl/trunk/include/cnl/all.h:233, from :1: /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h: In instantiation of 'constexpr auto cnl::literals::operator""_cnl2() [with char ...Chars = {'1', '6', '3', '8', '4', '.', '0', '0', '0', '0', '1', '5', '2', '5', '8', '7', '8', '9', '0', '6', '2', '5'}]': :28:14: required from here /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:170:72: in 'constexpr' expansion of 'cnl::_impl::parse_real()' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:335:38: in 'constexpr' expansion of 'cnl::_impl::parse_string()' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:300:58: in 'constexpr' expansion of 'cnl::_impl::parse_string(const char [22]{'1', '6', '3', '8', '4', '.', '0', '0', '0', '0', '1', '5', '2', '5', '8', '7', '8', '9', '0', '6', '2', '5'}, 21, 0, 10, 18, 0)' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:294:40: in 'constexpr' expansion of 'cnl::_impl::parse_string((((const char*)str) + ((sizetype)first_numeral)), num_digits, ((int)is_negative), base, stride)' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:283:38: in 'constexpr' expansion of '((long int (*)(const long int&))chunk_scale_op)((*(const long int*)(& std::move(init))))' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/_impl/parse.h:336:50: in 'constexpr' expansion of '0->cnl::_impl::make_scale_op_chunk(int)::()' /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:170:28: error: overflow in constant expression [-fpermissive] 170 | constexpr auto parsed{_impl::parse_real()}; | ^~~~~~ /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:171:94: error: no matching function for call to 'make_from_udl::significand, parsed.cnl::_impl::descaled::exponent, cnl::_impl::descaled::radix, 2>()' 171 | return _impl::make_from_udl(); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~ /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:116:38: note: candidate: 'template, >] ParsedSignificand, auto [requires cnl::integer<, >] ParsedExponent, int ParsedRadix, int UdlRadix> constexpr auto cnl::_impl::make_from_udl()' 116 | [[nodiscard]] constexpr auto make_from_udl() | ^~~~~~~~~~~~~ /opt/compiler-explorer/libs/cnl/trunk/include/cnl/elastic_scaled_integer.h:116:38: note: template argument deduction/substitution failed: :29:24: error: template argument 1 is invalid 29 | static_assert(std::is_same_v>>); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :32:24: error: template argument 1 is invalid 32 | static_assert(std::is_same_v>>); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Execution build compiler returned: 1

[F-Haferkorn]

@johnmcfarlane , Do you want me to fix this?

[johnmcfarlane]

You're welcome to submit PRs, yes! What did you have in mind though?