Building with GCC < 6.0 fails

[The-EDev]

When compiling with GCC 5 or 4 the following error is presented:

crow_all.h: In member function 'std::tuple<short unsigned int, std::vector<short unsigned int, std::allocator<short unsigned int> >, crow::routing_params> crow::Trie::find(const string&, const crow::Trie::Node*, unsigned int, crow::routing_params*, std::vector<short unsigned int>*) const':
crow_all.h:10028:63: error: converting to 'std::tuple<short unsigned int, std::vector<short unsigned int, std::allocator<short unsigned int> >, crow::routing_params>' from initializer list would use explicit constructor 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {const short unsigned int&, std::vector<short unsigned int, std::allocator<short unsigned int> >&, crow::routing_params&}; <template-parameter-2-2> = void; _Elements = {short unsigned int, std::vector<short unsigned int, std::allocator<short unsigned int> >, crow::routing_params}]'
                 return {node->rule_index, *blueprints, *params};
                                                               ^
crow_all.h:10155:50: error: converting to 'std::tuple<short unsigned int, std::vector<short unsigned int, std::allocator<short unsigned int> >, crow::routing_params>' from initializer list would use explicit constructor 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {short unsigned int&, std::vector<short unsigned int, std::allocator<short unsigned int> >&, crow::routing_params&}; <template-parameter-2-2> = void; _Elements = {short unsigned int, std::vector<short unsigned int, std::allocator<short unsigned int> >, crow::routing_params}]'
             return {found, found_BP, match_params}; //Called after all the recursions have been done

https://godbolt.org/z/rG53s9q5W

[sgoth]

Simply explicitly stating the std::tuple before the initializer list fixes it.
Also added

#include <cmath>
using std::isinf;
using std::isnan;

https://godbolt.org/z/hnn8PsEEd

[The-EDev]

@sgoth wow, Thanks a lot for your help!

[sgoth]

No, thanks to you for the great work!
Looking forward to find the release in conancenter 😃