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core: add an implementation based on C++26 destructuring into a pack (#220)

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Tested with clang-21

---------

Co-authored-by: Jean-Michaël Celerier <jeanmichael.celerier@gmail.com>
This commit is contained in:
Antony Polukhin
2025-09-07 20:26:44 +03:00
committed by GitHub
parent 5034bf55fb
commit d9fde1f2a0
12 changed files with 197 additions and 21 deletions
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1
test/config/print_config.cpp
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@@ -14,6 +14,7 @@
int main() {
std::cout << "Platform info:" << '\n'
<< "BOOST_PFR_USE_CPP17 == " << BOOST_PFR_USE_CPP17 << '\n'
<< "BOOST_PFR_USE_CPP26 == " << BOOST_PFR_USE_CPP26 << '\n'
<< "BOOST_PFR_USE_LOOPHOLE == " << BOOST_PFR_USE_LOOPHOLE << '\n'
<< "BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE == " << BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE << '\n'
<< "BOOST_PFR_HAS_GUARANTEED_COPY_ELISION == " << BOOST_PFR_HAS_GUARANTEED_COPY_ELISION << '\n'

16
test/core/Jamfile.v2
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@@ -23,7 +23,7 @@ project
[ requires cxx14_constexpr ]
;
########## BEGIN of helpers to detect Loophole trick support
########## BEGIN of helpers to detect Loophole and variadic structured binding support
actions mp_simple_run_action
{
@@ -42,6 +42,9 @@ rule mp-run-simple ( sources + : args * : input-files * : requirements * : targe
mp-run-simple loophole_detection.cpp : : : : compiler_supports_loophole ;
explicit compiler_supports_loophole ;
mp-run-simple variadic_structured_binding_detection.cpp : : : : compiler_supports_vsb ;
explicit compiler_supports_vsb ;
########## END of helpers to detect Loophole trick support
@@ -49,10 +52,14 @@ local DISABLE_ON_MSVC = ; #<toolset>msvc:<build>no ;
local REQUIRE_LOOPHOLE =
[ check-target-builds ../core//compiler_supports_loophole : : <build>no ]
;
local REQUIRE_VSB =
[ check-target-builds ../core//compiler_supports_vsb : : <build>no ]
;
local STRUCTURED_BINDING_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=0 <define>BOOST_PFR_USE_CPP17=1 [ requires cxx17_structured_bindings ] ;
local LOOPHOLE_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=1 <define>BOOST_PFR_USE_CPP17=0 $(REQUIRE_LOOPHOLE) ;
local CLASSIC_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=0 <define>BOOST_PFR_USE_CPP17=0 $(DISABLE_ON_MSVC) ;
local VARIADIC_STRUCTURED_BINDING_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=0 <define>BOOST_PFR_USE_CPP17=0 <define>BOOST_PFR_USE_CPP26=1 $(REQUIRE_VSB) ;
local STRUCTURED_BINDING_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=0 <define>BOOST_PFR_USE_CPP17=1 <define>BOOST_PFR_USE_CPP26=0 [ requires cxx17_structured_bindings ] ;
local LOOPHOLE_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=1 <define>BOOST_PFR_USE_CPP17=0 <define>BOOST_PFR_USE_CPP26=0 $(REQUIRE_LOOPHOLE) ;
local CLASSIC_ENGINE = <define>BOOST_PFR_USE_LOOPHOLE=0 <define>BOOST_PFR_USE_CPP17=0 <define>BOOST_PFR_USE_CPP26=0 $(DISABLE_ON_MSVC) ;
test-suite pfr_tests
:
@@ -109,6 +116,7 @@ local BLACKLIST_TESTS_FOR_CLASSIC =
for local source_file in [ glob ./run/*.cpp ] [ glob ../../example/*.cpp ]
{
local target_name = $(source_file[1]:B) ;
pfr_tests += [ run $(source_file) : : : $(VARIADIC_STRUCTURED_BINDING_ENGINE) : $(target_name)_vsb ] ;
pfr_tests += [ run $(source_file) : : : $(STRUCTURED_BINDING_ENGINE) : $(target_name)_sb ] ;
if ! $(target_name) in $(BLACKLIST_TESTS_FOR_LOOPHOLE)

2
test/core/run/core17_generated.cpp
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@@ -24,7 +24,7 @@ struct A {
};
int main() {
#if BOOST_PFR_USE_CPP17 && !defined(BOOST_USE_MODULES) // TODO: fix for BOOST_USE_MODULES
#if BOOST_PFR_USE_CPP17 && !BOOST_PFR_USE_CPP26 && !defined(BOOST_USE_MODULES) // TODO: fix for BOOST_USE_MODULES
const volatile int cv_value = 0;
volatile int v_value = 0;
const int c_value = 0;

23
test/core/variadic_structured_binding_detection.cpp Normal file
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@@ -0,0 +1,23 @@
// Copyright (c) 2020-2025 Antony Polukhin
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// Detection of variadic structured binding support
#include <type_traits>
struct MyPair {
int first;
int second;
};
template <class T>
auto test() {
const auto& [...x] = T{};
return x...[0];
}
int main() {
return ::test<MyPair>();
}