Cannot include/using from within a namespace or class

[elaine-jackson]

When using json.hpp (single include) if I include it from inside a namespace or a class like the following example. I'm unsure if this is intended behavior or a bug.

namespace Modals {
  #include <../lib/json.hpp>
  using json = nlohmann::json;
  class Person {
    ...
  }
}

My Makefile is... using the C++17 standard.

CXX       := g++
CXX_FLAGS := -Wall -Wextra -std=c++17 -ggdb

BIN     := bin
SRC     := src
INCLUDE := include
LIB     := lib
LIBRARIES   := 
EXECUTABLE  := main

all: $(BIN)/$(EXECUTABLE)

run: clean all
	clear
	@echo "🚀 Executing..."
	./$(BIN)/$(EXECUTABLE)

$(BIN)/$(EXECUTABLE): $(SRC)/*.cpp
	@echo "🚧 Building..."
	$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -L$(LIB) $^ -o $@ $(LIBRARIES) -lcurl

clean:
	@echo "🧹 Clearing..."
	-rm $(BIN)/*

I've included the error log for further analysis.
errors.txt

[gregmarr]

You definitely shouldn't do that. You've just introduced all of these types inside the Modals namespace when they expect to be in the global namespace. This extends not just to the types from json.hpp but also to all the types in all the standard headers included by the json.hpp header.