README.md

Examples for beman.optional26

List of usage examples for beman.optional26.

Samples

Check basic beman.optional26 library usages:

• local ./sample.cpp or sample.cpp@Compiler Explorer
• local ./std_vs_beman.cpp or std_vs_beman.cpp@Compiler Explorer
• local ./concept_checks.cpp or concept_checks.cpp@Compiler Explorer

Local Build and Run

# build
$ cmake --workflow --preset gcc-14

# run sample.cpp
$ .build/gcc-14/examples/RelWithDebInfo/sample
empty_opt is empty!
opt = 26

# run std_vs_beman.cpp
$ .build/gcc-14/examples/RelWithDebInfo/std_vs_beman
std_vs_beman: .has_value() matches?: yes
std_vs_beman: .value() matches?: yes

# run concept_checks.cpp
$ .build/gcc-14/examples/RelWithDebInfo/concept_checks

Range Support (P3168R2)

Range support added in Give std::optional Range Support (P3168R2) examples:

• local ./range_loop.cpp or range_loop.cpp@Compiler Explorer
• local ./pythagorean_triples.cpp or pythagorean_triples.cpp@Compiler Explorer

Local Build and Run

# build
$ cmake --workflow --preset gcc-14

# run range_loop.cpp
$ .build/gcc-14/examples/RelWithDebInfo/range_loop
                                               # note: 1st log (empty_opt) is missing from console!
"for each loop" over C++26 optional: opt = 26  # 2nd log (non empty opt)

# run pythagorean_triples.cpp
$ .build/gcc-14/examples/RelWithDebInfo/pythagorean_triples
First 10 Pythagorean triples:
(3, 4, 5)
(6, 8, 10)
(5, 12, 13)
(9, 12, 15)
(8, 15, 17)
(12, 16, 20)
(7, 24, 25)
(15, 20, 25)
(10, 24, 26)
(20, 21, 29)
100th Pythagorean triple (x, y, z <= 200): (26, 168, 170)

Optional Reference (P2988R5)

Reference support added in std::optional<T&>(P2988R5) examples:

• local ./optional_ref.cpp or optional_ref.cpp@Compiler Explorer

Local Build and Run

# build
$ cmake --workflow --preset gcc-14

# run optional_ref.cpp
$ .build/gcc-14/examples/RelWithDebInfo/optional_ref