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Update readme remove example

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Sven Fink 2021-08-04 08:04:49 +02:00
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19
README.md
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@ -105,23 +105,12 @@ In your initial call to cmake simply add:
cmake [..] -DBUILD_SHARED_LIBS=ON [..]
```
## Providing access to nlohmann-json
## nlohmann-json integration
The CMake-file of this libraries tries several ways to ultimately include
`nlohmann/json.hpp`
As nlohmann-json is a dependency, this library tries find it.
During the cmake-configurate-step there are 3 tries done trying to
access nlohmann-json:
1. link with a nlohmann_json::nlohmann_json-target,
2. find the nlohmann_json-cmake-package and link with nlohmann_json::nlohmann_json-target or
3. find path to `nlohmann/json.hpp`.
1 is there to make it work when this project is added as
a sub-directory (via `add_subdirectory()`), 2 and 3 can be
assisted by setting the `nlohmann_json_DIR`-variable.
For 1 there is an example of you to do in example/cmake-submodule.
The cmake-configuration first checks if nlohmann-json is available as an cmake-target. This may happen, because it is used as a submodule in a super-project which already provides and uses nlohmann-json.
Otherwise, it calls `find_package` for nlohmann-json and requires that library to be installed on the system.
### Building with Hunter package manager

24
example/cmake-submodule/CMakeLists.txt
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@ -1,24 +0,0 @@
cmake_minimum_required(VERSION 3.2)
project(simple-json-validator-as-submodule-test)
# absolute-path
set(PATH_TO_NLOHMANN_JSON_REPO $ENV{HOME}/devel/upstream/json)
# build shared library
set(BUILD_SHARED_LIBS ON)
# JSON library
option(JSON_BuildTests OFF)
add_subdirectory(${PATH_TO_NLOHMANN_JSON_REPO}
json-binary-dir
EXCLUDE_FROM_ALL)
# JSON SCHEMA VALIDATOR library
option(BUILD_TESTS OFF)
add_subdirectory(../..
json-validator-binary-dir
EXCLUDE_FROM_ALL)
add_executable(validate validate.cpp)
target_link_libraries(validate nlohmann_json_schema_validator)

20
example/cmake-submodule/validate.cpp
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@ -1,20 +0,0 @@
#include <nlohmann/json-schema.hpp>
#include <iostream>
int main(void)
{
nlohmann::json schema_json{{"type", "number"}};
nlohmann::json_schema::json_validator validator;
validator.set_root_schema(schema_json);
validator.validate(1);
try {
validator.validate("\"1\"");
} catch (const std::exception &e) {
std::cerr << "expected exception: " << e.what() << "\n";
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}