Niels Lohmann
6197341a21
* Clean up README, contribution guide, and repository metadata - REUSE.toml: fix the Hedley path and SPDX id (CC0-1.0), mark the docset icons as the public-domain JSON logo - CITATION.cff: v3.12.0 was released on 2025-04-11 - FILES.md: list all workflows, describe the Meson option defaults - README: ctest -LE, table of contents, typos, stale Android/MinGW advice, moved links, merge duplicate Thanks entries, list the analysis tools used in CI - CONTRIBUTING: iterative parser, json_literals.hpp is generated, links - .gitignore: backups and release outputs; .gitattributes: mark generated files - labeler: label other build systems and .github documentation - MODULE.bazel: add the module version Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Clean up CI, CMake, Makefile, and Bazel files - CMakeLists.txt: avoid VERSION_GREATER_EQUAL, which CMake < 3.7 lacks - ci.cmake: test JSON_DisableTupleReferenceConversion in ci_cmake_flags, remove unused variables and unreachable per-compiler targets, look up Clang tools consistently, forward CMAKE_CXX_FLAGS to ci_module_cpp20, format json_literals.hpp and remove backups in ci_test_amalgamation - BUILD.bazel: add json_literals.hpp to the single-header target - workflows: format json_literals.hpp before copying it, drop the obsolete natvis --version plumbing, name natvis and macro_builder in failure messages, drop the duplicate amalgamation job, install Valgrind only where needed, republish docs on version bumps, fix stale names - Makefile: complete .PHONY and help, check-amalgamation always restores the checked-in files, natvis uses its own venv, macro_builder_check installs astyle, clean removes the fuzzer binaries - remove tools/amalgamate/config_json_view.json (json_view.hpp is not on develop yet) Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Fix inaccuracies in the documentation - version history: json_base_class_t (3.11.3), JSON_HAS_CPP_11 (3.10.0), JSON_HAS_RANGES exclusions, define-type macros, ABI tags - releases: 3.12.0 raised the minimum CMake version - from_*: the (ptr, len) overloads are deleted, not removed, in 4.0.0 - contains/count/find: document the deleted integral overloads - add JSON_HAS_RANGE_VIEW_CONVERSION and list the JSON_HAS_* macros in the macro overview - mention BON8 and error_handler where binary formats are listed - broken links, outdated URLs, warning count, Hunter v0.26.12 - copy_markdown_source hook: expand snippets in the Markdown copies Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Pass /EHsc to the Windows C++20 module build ci_module_cpp20 now forwards CMAKE_CXX_FLAGS to the module build. The Windows workflow sets CMAKE_CXX_FLAGS, which replaces CMake's MSVC defaults including /EHsc, so <chrono> failed with C4530 under /WX. Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END
#define NLOHMANN_JSON_NAMESPACE_BEGIN /* value */ // (1)
#define NLOHMANN_JSON_NAMESPACE_END /* value */ // (2)
These macros can be used to open and close the nlohmann namespace. See
nlohmann Namespace for details.
- Opens the namespace.
- Closes the namespace.
Default definition
The default definitions open and close the nlohmann namespace. The precise definition of
NLOHMANN_JSON_NAMESPACE_BEGIN varies as described here.
-
Default definition of
NLOHMANN_JSON_NAMESPACE_BEGIN:namespace nlohmann { inline namespace json_abi_v3_12_0 { -
Default definition of
NLOHMANN_JSON_NAMESPACE_END:} // namespace json_abi_v3_12_0 } // namespace nlohmann
When these macros are not defined, the library will define them to their default definitions.
Examples
??? example
The example shows how to use `NLOHMANN_JSON_NAMESPACE_BEGIN`/`NLOHMANN_JSON_NAMESPACE_END` from the
[How do I convert third-party types?](../../features/arbitrary_types.md#how-do-i-convert-third-party-types) page.
```cpp
--8<-- "examples/nlohmann_json_namespace_begin.c++17.cpp"
```
Output:
```json
--8<-- "examples/nlohmann_json_namespace_begin.c++17.output"
```
See also
Version history
- Added in version 3.11.0. Changed inline namespace name in version 3.11.2.