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Fix #459: Fill out the set of conversion functions for all POD types (#664)

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Previously, to_<type> only accepted a string or the same type (identity),
and <type>() constructors only accepted Boxed_Number. This left gaps such as
to_int(char), to_char(int), char(string), int(string), and to_double(char).

Add two overloads to bootstrap_pod_type: to_<name>(Boxed_Number) enables
cross-type numeric conversions (e.g. to_int('A') → 65, to_char(65) → 'A'),
and <name>(string) via parse_string enables construction from strings
(e.g. char("A") → 'A', int("65") → 65, double("3.5") → 3.5).

Co-authored-by: leftibot <leftibot@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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leftibot 2026-04-11 16:08:09 -06:00 committed by GitHub
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commit 1b27d0dd15
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2 changed files with 35 additions and 0 deletions
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2
include/chaiscript/dispatchkit/bootstrap.hpp
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@ -115,6 +115,8 @@ namespace chaiscript::bootstrap {
m.add(fun(&parse_string<T>), "to_" + name);
m.add(fun([](const T t) { return t; }), "to_" + name);
m.add(fun([](const Boxed_Number &bn) { return bn.get_as<T>(); }), "to_" + name);
m.add(fun(&parse_string<T>), name);
}
/// "clone" function for a shared_ptr type. This is used in the case

33
unittests/conversion_functions.chai Normal file
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@ -0,0 +1,33 @@
// Test that all conversion functions work across char, int, and string types
// char() constructor
assert_equal('A', char('A')) // char from char (identity via Boxed_Number)
assert_equal('A', char(65)) // char from int (via Boxed_Number)
assert_equal('A', char("A")) // char from string (new)
// to_char() conversions
assert_equal('A', to_char('A')) // to_char from char (identity)
assert_equal('A', to_char(65)) // to_char from int (new, via Boxed_Number)
assert_equal('A', to_char("A")) // to_char from string (existing)
// int() constructor
assert_equal(65, int('A')) // int from char (via Boxed_Number)
assert_equal(65, int(65)) // int from int (identity via Boxed_Number)
assert_equal(65, int("65")) // int from string (new)
// to_int() conversions
assert_equal(65, to_int('A')) // to_int from char (new, via Boxed_Number)
assert_equal(65, to_int(65)) // to_int from int (identity)
assert_equal(65, to_int("65")) // to_int from string (existing)
// to_string() conversions
assert_equal("A", to_string('A'))
assert_equal("65", to_string(65))
assert_equal("A", to_string("A"))
// double conversions
assert_equal(3.5, double("3.5")) // double from string (new)
assert_equal(3.5, to_double("3.5")) // to_double from string (existing)
assert_equal(65.0, to_double('A')) // to_double from char (new, via Boxed_Number)
assert_equal(65.0, to_double(65)) // to_double from int (new, via Boxed_Number)
assert_equal("3.5", to_string(3.5)) // to_string from double (existing)