Top-level template function

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support functions like the following; top-level template functions

template<typename T> std::vector<T> gen_normal_dist(std::size_t n, const RandGenParams<T> &params = { });

[wavewave]

Done by #179

[wavewave]

HROOT has a problem with this feature. reopened this until the issue is sorted out.

[wavewave]

the HROOT build issue was the following:

[239 of 239] Compiling HROOT.Core       ( src/HROOT/Core.hs, dist/build/HROOT/Core.p_o )

In file included from csrc/HROOTCoreTColor.cpp:10:0: error: 
csrc/HROOTCoreTColor.cpp: In function ‘TArrayI_t* TColor_tColor_GetPalette()’:

csrc/HROOTCoreTColor.h:46:40: error:
     error: invalid conversion from ‘const TArrayI*’ to ‘TArrayI*’ [-fpermissive]
       46 | return to_nonconst<TArrayI_t, TArrayI>(&(TColor::GetPalette()));\
          |                                        ^~~~~~~~~~~~~~~~~~~~~~~
          |                                        |
          |                                        const TArrayI*
   |
46 | return to_nonconst<TArrayI_t, TArrayI>(&(TColor::GetPalette()));\
   |                                        ^

csrc/HROOTCoreTColor.cpp:25:1: error:
     note: in expansion of macro ‘TCOLOR_DEF_NONVIRT’
       25 | TCOLOR_DEF_NONVIRT(TColor)
          | ^~~~~~~~~~~~~~~~~~
   |
25 | TCOLOR_DEF_NONVIRT(TColor)
   | ^

In file included from csrc/HROOTCoreTColor.cpp:2:0: error: 

/nix/store/8vp2j0mvfx18mzilja6aazxl79bs23sa-fficxx-runtime-0.6/lib/ghc-8.6.5/x86_64-linux-ghc-8.6.5/fficxx-runtime-0.6-4KxP04WpE1zBFdcmvApGUh/include/MacroPatternMatch.h:27:31: error:
     note:   initializing argument 1 of ‘ToType* to_nonconst(FromType*) [with ToType = TArrayI_tag; FromType = TArrayI]’
       27 | ToType* to_nonconst(FromType* x) {
          |                     ~~~~~~~~~~^
   |
27 | ToType* to_nonconst(FromType* x) {
   |                               ^
`cc' failed in phase `C Compiler'. (Exit code: 1)
error: builder for '/nix/store/4rwqvmr2c5kwf9052m2ah4pfc6vsjc0s-HROOT-core-0.10.0.1.drv' failed with exit code 1;
       last 10 log lines:
       > In file included from csrc/HROOTCoreTColor.cpp:2:0: error: 
       > 
       > /nix/store/8vp2j0mvfx18mzilja6aazxl79bs23sa-fficxx-runtime-0.6/lib/ghc-8.6.5/x86_64-linux-ghc-8.6.5/fficxx-runtime-0.6-4KxP04WpE1zBFdcmvApGUh/include/MacroPatternMatch.h:27:31: error:
       >      note:   initializing argument 1 of ‘ToType* to_nonconst(FromType*) [with ToType = TArrayI_tag; FromType = TArrayI]’
       >        27 | ToType* to_nonconst(FromType* x) {
       >           |                     ~~~~~~~~~~^
       >    |
       > 27 | ToType* to_nonconst(FromType* x) {
       >    |                               ^
       > `cc' failed in phase `C Compiler'. (Exit code: 1)
       For full logs, run 'nix log /nix/store/4rwqvmr2c5kwf9052m2ah4pfc6vsjc0s-HROOT-core-0.10.0.1.drv'.
error: 1 dependencies of derivation '/nix/store/fn56rga13zgahhhb1aghh1anzvd5kq4w-HROOT-0.10.0.1.drv' failed to build